Gemstone guide
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What is Star Sapphire?
Star Sapphire is the sapphire variety of corundum, coloured by trace elements (primarily iron and titanium). A guide to the gem, and to buying one well.
About Star Sapphire
01- Species
- Corundum
- Variety
- Sapphire
- Hardness (Mohs)
- 9
- Refractive index
- 1.76 - 1.77
- Colour caused by
- Trace elements (primarily iron and titanium)
Star sapphires are a rare and captivating variety of corundum, renowned for their enchanting asterism—a star-like phenomenon that appears to dance across the surface of the gem. These extraordinary stones are primarily sourced from the storied lands of Sri Lanka, where nature's artistry is at its finest. The allure of a star sapphire lies not only in its celestial beauty but also in its natural formation, as many of our stones remain unheated, preserving their pure, untouched essence.
These gems are often presented in a cabochon cut, a style that enhances the star effect and showcases their unique charm. The subtlety of grey hues combined with the intriguing play of light makes each star sapphire a one-of-a-kind masterpiece. With prices starting from around $100 per carat, these gems offer both elegance and a touch of the ethereal.
Judging quality
02What drives the value
- Size (carat weight)
- Quality of asterism
- Clarity
- Color saturation
What to watch for when buying
- Overlooking the importance of asterism quality
- Assuming all star sapphires are heated
- Neglecting to verify the origin
Inclusions you may see
- Silk (rutile needles)
- Feather inclusions
Origin, treatment and trade names
03Where it comes from
TreatmentAs disclosed for the stones we sell; every listing states its own.
Trade names
From our stock
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Frequently Asked Questions
05Where do STARLANKA's star sapphires come from?
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Our star sapphires are primarily sourced from Sri Lanka, a region renowned for producing some of the world's finest sapphires.
Are STARLANKA's star sapphires treated?
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Many of our star sapphires are unheated, showcasing their natural beauty and maintaining their original allure.
What determines the value of a star sapphire?
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The value of a star sapphire is influenced by the clarity and visibility of its star effect, the quality of its colour, and its overall clarity and cut.
How should I choose a star sapphire?
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When choosing a star sapphire, consider the sharpness and symmetry of the star, the depth and uniformity of the colour, and the overall clarity of the stone.
Are STARLANKA's star sapphires certified?
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Many of our star sapphires come with a laboratory certificate, and certification is available on request for any stone.
Shop
Star Sapphire
Every stone shows its own price, weight, origin and treatment. Browse our star sapphire, or contact our team for personal help choosing one.