Gemstone guide
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What is Blue Star Sapphire?
Blue 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 Blue 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)
Discover the enchanting allure of Blue Star Sapphires, a gemstone that captivates with its celestial elegance and unique optical phenomenon. These remarkable stones, originating from the esteemed locales of Madagascar, Burma, and Sri Lanka, are cherished for their captivating star-like reflection, known as asterism, which dances gracefully across their surface. The value of a Blue Star Sapphire is driven by the intensity and uniformity of its blue hue, often found in the esteemed Cornflower Blue variety, and the clarity of its star pattern.
Our collection features exquisite unheated specimens, preserving the natural beauty of each stone. With prices starting from around $13 per carat, these gems offer a range of options for the discerning collector. Many of our Blue Star Sapphires are accompanied by certification from renowned laboratories such as AIGS, ensuring the authenticity and quality of your selection.
Judging quality
02What drives the value
- Asterism
- Color saturation
- Size and weight
- Origin
What to watch for when buying
- Overlooking treatments that may affect value
- Misidentifying star effect quality
- Assuming all blue sapphires exhibit asterism
Inclusions you may see
- Silk (rutile needles)
- Feather inclusions
- Color zoning
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
05What are the origins of Blue Star Sapphires?
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Blue Star Sapphires in our collection originate from Madagascar, Burma, and Sri Lanka, each known for producing stones of exceptional quality.
Are Blue Star Sapphires treated?
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The Blue Star Sapphires we offer are unheated, maintaining their natural beauty and allure without enhancement.
What drives the value of a Blue Star Sapphire?
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The value of a Blue Star Sapphire is primarily driven by the intensity of its blue colour, the clarity and symmetry of the star effect, and the origin of the stone.
How should I choose a Blue Star Sapphire?
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When choosing a Blue Star Sapphire, consider the depth and uniformity of its colour, the distinctness of the star, and the quality of the cabochon cut.
Is certification available for Blue Star Sapphires?
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Many Blue Star Sapphires in our collection are accompanied by a laboratory certificate from AIGS, and certification is available on request for any stone.
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Blue Star Sapphire
Every stone shows its own price, weight, origin and treatment. Browse our blue star sapphire, or contact our team for personal help choosing one.