Gemstone guide
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What is Alexandrite?
Alexandrite is a variety of chrysoberyl, coloured by chromium and vanadium. A guide to the gem, and to buying one well.
About Alexandrite
01- Species
- Chrysoberyl
- Variety
- Alexandrite
- Hardness (Mohs)
- 8.5
- Refractive index
- 1.74 - 1.75
- Colour caused by
- Chromium and Vanadium
Alexandrite, a gemstone of mesmerising intrigue, is renowned for its extraordinary colour-changing ability. This rare chrysoberyl variety captivates with its ability to transition from a lush green in daylight to a profound red under incandescent light, a phenomenon that has enchanted collectors and connoisseurs alike. Originating from the esteemed locales of India, Madagascar, and Sri Lanka, each stone is a testament to nature's artistry, with no two stones alike.
At STARLANKA, our collection of Alexandrite is presented in an array of exquisite cuts, including the elegant Emerald Cut and the sophisticated Brilliant Diamond Cut. Many of our stones remain unheated, preserving their natural allure. Prices for these gems start from around $810 per carat, reflecting their rarity and the meticulous craftsmanship involved in their preparation.
Judging quality
02What drives the value
- Color change phenomenon
- Size
- Clarity
- Origin
What to watch for when buying
- Overlooking synthetic alternatives
- Misidentifying color change under different lighting
- Assuming all Alexandrite is unheated
Inclusions you may see
- Silk
- Needle-like inclusions
- Liquid inclusions
Origin, treatment and trade names
03Where it comes from
TreatmentAs disclosed for the stones we sell; every listing states its own.
Trade names
Price per carat
04- Typical price
- $2,020 per carat
- Most stones
- $764–$6,660 per carat
- Based on
- 17 stones in our stock, updated weekly. Alexandrite prices by carat size →
From our stock
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From the journal
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Frequently Asked Questions
07Where do Alexandrite gemstones originate?
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Our Alexandrite gemstones originate from India, Madagascar, and Sri Lanka, each offering unique characteristics influenced by their geographic provenance.
Are Alexandrite gemstones treated?
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Many of our Alexandrite stones are unheated, retaining their natural beauty and colour-changing properties. Any treatments are disclosed for transparency.
What drives the value of Alexandrite?
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The value of Alexandrite is driven by its remarkable colour change, clarity, and origin. The more pronounced the colour change, the more desirable the stone.
How should I choose an Alexandrite gemstone?
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When choosing an Alexandrite, consider the intensity of its colour change, clarity, and cut. Each stone is unique, so select one that resonates with your personal taste.
Is certification available for Alexandrite gemstones?
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Many of our Alexandrite gemstones are accompanied by certificates from renowned labs such as GIA, GRS, and AIGS. Certification is available on request for any stone.
Shop
Alexandrite
Every stone shows its own price, weight, origin and treatment. Browse our alexandrite, or contact our team for personal help choosing one.