Star Sapphire

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Physical & Optical Properties

Category Precious Gems
Mohs Hardness 9.0
Specific Gravity 3.9 – 4.05
Refractive Index 1.758 – 1.78
Crystal System Trigonal
Color blue
Birefringence 0.007

Mohs Hardness

Mohs Hardness: 9.0
1 Soft10 Hard

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Investment ($5,000+/ct)

About Star Sapphire

Star Sapphire is a corundum displaying a four- or six-rayed asterism caused by silk-like rutile or hematite inclusions intersecting at angles within the gem, producing a ghostly floating star visible under direct light. The Star of India, a 563-carat blue star sapphire from Sri Lanka, is the world's largest gem-quality sapphire and resides at the American Museum of Natural History. Sri Lanka, Myanmar, and Australia produce the most significant star sapphires.

Jewelry Use

Durability 10/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Star Sapphire?
Star Sapphire is a corundum displaying a four- or six-rayed asterism caused by silk-like rutile or hematite inclusions intersecting at angles within the gem, producing a ghostly floating star visible under direct light. The Star of India, a 563-carat blue star sapphire from Sri Lanka, is the world's
What is the hardness of Star Sapphire?
Star Sapphire has a Mohs hardness of 9.0, making it excellent for use in jewelry.
What color is Star Sapphire?
Star Sapphire is primarily Blue.
How much does Star Sapphire cost?
Star Sapphire falls into the Investment ($5,000+/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Star Sapphire?
Star Sapphire belongs to the Trigonal crystal system.

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