Clean, cool, and captivating — ‘Persian’ is a minimal square-cut navy blue Iolite stud set in 925 Sterling Silver and coated with rhodium. Just 2 grams light, yet bold in tone and energy.
Classic calm, reimagined — from our ‘Back to Office’ lightwear essentials.
🔮 Iolite, the stone of vision and intuition, promotes clarity, harmony, and inner strength — a favourite for Capricorns, Aquarians, and Virgos.
✨ Hypoallergenic silver offers comfort and elegance for sensitive skin.
Note: Minor visual variations are natural due to light refraction and lens effects.
✔ Ethically handcrafted in India
✔ 100% real gemstones
✔ Local sourcing & sustainable methods
✔ Pan-India free shipping
✔ Secured payment & happy customers
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Raw Celestite clusters are now only click away.
Each cluster is as naturally found without polishing or dyeing. Each cluster is approx 150 grams and more.
Celestite is known for its powerful vibrations and is effectively used to balance the body, mind and soul. It attracts love, health and good fortune. Celestite harmonises tense atmospheres.
Additional Information:
- Stone : Celestite
- Colour : Blue, Yellow, Red, White
- How to use : Place anywhere as appropriate. Celestite can be places anywhere in a room to improve the vibrations of the surrounding environment
- How to energise : Hold your raw crystal in your hand, close your eyes and manifest the intention for the stone
- How to clean : DO NOT PUT IN WATER OR IN DIRECT SUNLIGHT
- Birthstone : Beneficial for Aries sun-sign
Disclaimer: There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
The product may have cracks or dents, that is because the product has been made using authentic stones without any whitewashing.
- Handcrafted by local artisan using locally sourced materials;
- 100% Made in India;
- Authentic products made of real gems;
- Secured Payment;
- Free shipping all over India; and
- Happy Customers.
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Get in on the trend, with our latest hand woven braided bracelets. Made with a single tumble stone, it is light, easy to wear and looks stylish, be it for a casual or formal setting. Keep away from water to ensure longevity of the bracelet.
The “Royal” braided bracelet is made with Blue Lace Agate and Lapis Lazuli stones, with an indigo blue thread and engraved German silver stoppers to give it a classy look. The threads are adjustable making the bracelet wearable by any one at any time.
Blue Lace Agate has a soft energy which is very cooling and calming and often used to heal and bring peace of mind. It enables expression of thought and feelings. Being a nurturing stone, it neutralises anger.
Additional Information:
- Stone : Blue Lace Agate
- Colour : Pale Blue with white or darker lines
- How to wear : Place as appropriate
- Origin : As Agate
- Birthstone : Gemini and Pisces
Known to be a powerful protector and cleanser, Lapis Lazuli aids in bringing peace and serenity and helps in mending relations. It enhances positive energy thereby strengthening the mind, provides clarity of thought and is famous for attracting good fortune and luck.
Lapis Lazuli is beneficial for all air signs being Aquarius, Gemini, and Libra.
Disclaimer: There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
The product may have cracks or dents, that is because the product has been made using authentic stones without any whitewashing.
- Handcrafted by local artisan using locally sourced materials;
- 100% Made in India;
- Authentic products made of real gems;
- Secured Payment;
- Free shipping all over India; and
- Happy Customers.
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Customer Reviews
The ‘Sky’ bracelet is made of the finest 4mm round Lapis Lazuli stones.
Known to be a powerful protector and cleanser, Lapis Lazuli aids in bringing peace and serenity and helps in mending relations. It enhances positive energy thereby strengthening the mind, provides clarity of thought and is famous for attracting good fortune and luck.
Lapis Lazuli is beneficial for all air signs being Aquarius, Gemini, and Libra.
The bracelet has an engraved German silver stopper.
Disclaimer: There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
The product may have inclusions, cracks or dents, that is because the product has been made using authentic stones without any whitewashing.
- Handcrafted by local artisan using locally sourced materials;
- 100% Made in India;
- Authentic products made of real gems;
- Secured Payment;
- Free shipping all over India; and
- Happy Customers.
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Customer Reviews
Add a pop of colour with our latest Turquoise Wall Hanging. A truly unique piece, it is hand crafted and made with Turquoise and raw Crystal Quartz stones.
The Turquoise Wall Hanging has a delicate teal blue thread work and is approximately 18.5 inches in length and weighs 396 grams. There are raw crystal hangings at the end of each wall hanging to enhance the overall look. This piece has Crystal Quartz as the raw crystal ends.
Turquoise is known to be a healer and protector. It enhances well being of the wearer, improves romantic connections and wards off evil and negativity. Turquoise stabilizes mood swings and helps alleviate exhaustion.
Additional Information
- Stone : Turquoise
- Colour : Turquoise, Green, Blue
- How to wear : Place as appropriate anywhere, especially helpful when placed over the throat, third eye and solar plexus
- Origin : Worldwide
- Birthstone : Sagittarius (November 22 - December 21) and Capricorn (December 22-January 19). It is also the planetary stone for Aquarius (January 20-February 18).
Clear Crystal Quartz is an extremely powerful healing stone and has been called the ‘Universal Crystal’ because of its myriad properties. Clear Crystal Quartz is said to amplify one's energy by regulating it and aids concentration and memory. Physically, Clear Crystal Quartz stimulates the immune system and balances the mind and body.
Additional Information
- Stone : Clear Crystal Quartz
- Colour : Clear
- How to wear : Place as appropriate
- Origin : Worldwide
- Birthstone : Helpful to Leo in need of energy, Capricorn to reduce its stubbornness and Gemini be more tolerant.
Disclaimer: There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
The product may have cracks or dents, that is because the product has been made using authentic stones without any whitewashing.
- Handcrafted by local artisan using locally sourced materials;
- 100% Made in India;
- Authentic products made of real gems;
- Secured Payment;
- Free shipping all over India; and
- Happy Customers.
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Customer Reviews
The ‘Persea’ bracelet is made of the finest Larimar stones, with a range of cool blue colours and gorgeous hand engraved German silver stopper. Each bead is 6mm in size.
Larimar is a newly discovered gem known for spreading peace and love. It is helpful in harmonising the body, mind and soul thus enabling deep meditation, alleviating fears, promotes serenity and aids those seeking love.
Pair this gorgeous piece with Indian or western wear and amp your look.
Additional Information:
- Stone : Larimar
- Colour : Blue, Blue Green, Gray, Red, White
- How to wear : Wear for long periods of time, place on feet
- Origin : Dominican Republic, Bahamas
- Birthstone : Per modern interpretations Larimar is extremely beneficial for those born in spring (20 March - 19 April)
Disclaimer: There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
The product may have cracks or dents, that is because the product has been made using authentic stones without any whitewashing.
- Handcrafted by local artisan using locally sourced materials;
- 100% Made in India;
- Authentic products made of real gems;
- Secured Payment;
- Free shipping all over India; and
- Happy Customers.
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Marina
The ‘Marina’ bracelet is made of the finest Lapis Lazuli stones.
This unique piece has tiny blue beads.
Lapis Lazuli is known to be a powerful protector and cleanser, it aids in bringing peace and often used to mitigate mental ailments. It is especially helpful in mending relations.
Lapis Lazuli enhances positive energy thereby strengthening the mind and providing clarity of thought.
Lapis Lazuli is an attractor good fortune and luck.
|
Stone |
Lapis Lazuli |
|
Colour |
Blue |
|
Category |
Bracelet |
|
Product Code |
BR01BLLLCH |
|
Bead Size |
Chunky |
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Waves
The ‘Waves’ bracelet is made of the finest Sodalite stones.
Sodalite stones block electronic radiations thereby negating the harmful impact of electronics. It is particularly helpful in stimulating harmony, solidarity, trust and companionship thereby greatly improving inter-personal relations. Further, Sodalite helps calm the mind and encourages rationality of thought
|
Stone |
Sodalite |
|
Colour |
Blue |
|
Category |
Bracelet |
|
Product Code |
BR01BLSO |
|
Bead Size |
8mm |
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.
Cyan
The ‘Cyan’ bracelet is made of the finest Turquoise and Agate stones. Each bead is 6mm in size with an engraved German silver stopper.
Turquoise is known to be a healer and protector. It enhances well being of the wearer, improves romantic connections and wards off evil and negativity. Turquoise stabilizes mood swings and helps alleviate exhaustion.
Agate is known to be a healer as it helps calm the mind and body and bring about peace. It negates negative energies, controls anger, soothes inflammation and extinguishes illness and infection.
Additional Information:
- Stone : Agate
- Colour : Clear, Milky White, Grey, Green, Blue, Pink , Brown. Often artificially coloured
- How to wear : Hold or place on body or appropriate location
- Origin : U.S.A, India, Morocco, Czech Republic, Brazil, Africa
- Rarity : Easily obtained.
The ANNUTRA team seeks to deliver value with each product that has a deeper meaning attached to it, everything is hand crafted making each piece unique.
We only use stones of the highest quality and are happy to provide a certificate of authenticity at an additional cost.
We generally ship products out in 1 to 2 business days and deliveries are made within the week.
Packaging
All our products are sent in our custom made and sustainable packaging. The product is first wrapped in a cloth bag and then secured in a gift box.

Care instructions for Annutra bracelets:
- Use a mild cleaning spray or liquid to clean the bracelet before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the bracelet.
- Wear the bracelet in your left hand unless advised otherwise by your astrologer or Pandit.
- It is imperative that the bracelet be kept away from water.
Care instructions for Annutra German silver chains:
- Use a mild cleaning spray or liquid to clean the chain before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the chain.
- Refrain from using the chain for heavy pendants.
- Use the chain delicately, use of force will result in the chain breaking.
- It is imperative that the chain be kept away from water.
Care instructions for Annutra pendants / necklaces:
- Use a mild cleaning spray or liquid to clean the pendant/ necklaces before first use and if required after each use.
- Use the Annutra box/ cloth bag provided for safekeeping the pendant/ necklace.
- Refrain from using force when wearing the pendant/ necklace, as you may damage the piece.
Care instructions for Annutra home decor:
- Use a mild cleaning spray or liquid to clean the product before first use and if required after each use.
- Use the Annutra box provided for safekeeping the product.
- Refrain from using force on the product as you may damage the piece.
Disclaimer: The pieces are often delicate and need to be used with ease.
There may be a slight difference in the photo shown and the actual product. That is purely because of light, stone refraction index and the lens used.