Star Ruby

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Physical & Optical Properties

Category Precious Gems
Mohs Hardness 9.0
Specific Gravity 3.95 – 4.1
Refractive Index 1.757 – 1.78
Crystal System Trigonal
Fracture Uneven,Conchoidal
Color red
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 Ruby

Star Ruby is a corundum variety displaying a six-rayed asterism caused by needle-like rutile inclusions oriented in three directions within the crystal, producing a luminous floating star when viewed under a single light source. Myanmar's Mogok Valley produces the world's finest star rubies, with deep red pigeon's blood stones displaying strong, sharp stars being the most valuable. The most famous, the Rosser Reeves Star Ruby at 138.7 carats, resides in the Smithsonian Institution.

Jewelry Use

Durability 10/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Star Ruby?
Star Ruby is a corundum variety displaying a six-rayed asterism caused by needle-like rutile inclusions oriented in three directions within the crystal, producing a luminous floating star when viewed under a single light source. Myanmar's Mogok Valley produces the world's finest star rubies, with de
What is the hardness of Star Ruby?
Star Ruby has a Mohs hardness of 9.0, making it excellent for use in jewelry.
What color is Star Ruby?
Star Ruby is primarily Red.
How much does Star Ruby cost?
Star Ruby 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 Ruby?
Star Ruby belongs to the Trigonal crystal system.

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