Gemstone guide
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What is Star Ruby?
Star Ruby is the ruby variety of corundum, coloured by chromium. A guide to the gem, and to buying one well.
About Star Ruby
01- Species
- Corundum
- Variety
- Ruby
- Hardness (Mohs)
- 9
- Refractive index
- 1.76 - 1.77
- Colour caused by
- Chromium
Discover the allure of Star Ruby, an exquisite gemstone that captivates with its celestial charm. Known for its enchanting asterism, the Star Ruby displays a mesmerising star-like effect across its surface, a phenomenon that is best showcased in cabochon cuts. Our collection features Star Rubies originating from the storied lands of Burma and Sri Lanka, renowned for producing some of the world's most exquisite specimens.
The value of a Star Ruby is driven by its captivating colour, clarity, and the distinctiveness of its star. With hues ranging from delicate pinks to deep reds, each stone is unique, offering a spectrum of beauty. Our selection includes unheated stones, preserving their natural allure and enhancing their desirability. Prices begin from around $250 per carat, reflecting the rarity and quality of these gems.
Judging quality
02What drives the value
- Intensity of color
- Clarity
- Strength and visibility of asterism
What to watch for when buying
- Overlooking the quality of asterism
- Assuming all star rubies are unheated
- Not verifying the origin
Inclusions you may see
- Needles (rutile) causing asterism
- Silk 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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From the journal
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Frequently Asked Questions
06Where do Star Rubies originate?
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Our Star Rubies originate from Burma and Sri Lanka, regions celebrated for their high-quality gemstones.
Are Star Rubies treated?
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The Star Rubies in our collection are unheated, maintaining their natural beauty and authenticity.
What drives the value of a Star Ruby?
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The value of a Star Ruby is influenced by its colour, clarity, and the sharpness of its star effect, with deeper reds and clearer stars being particularly prized.
How should I choose a Star Ruby?
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When selecting a Star Ruby, consider the intensity of its colour, the clarity of the stone, and the definition of the star effect, as these factors contribute to its overall beauty and value.
Is certification available for Star Rubies?
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Many of our Star Rubies are accompanied by a laboratory certificate from AIGS, and certification is available on request for any stone.
Shop
Star Ruby
Every stone shows its own price, weight, origin and treatment. Browse our star ruby, or contact our team for personal help choosing one.