Starlite

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Physical & Optical Properties

Mohs Hardness 6.5 – 7.5
Specific Gravity 3.91 – 4.73
Refractive Index 1.79 – 2.015
Crystal System Tetragonal
Luster Adamantine
Cleavage Distinct
Fracture Conchoidal
Color various
Birefringence 0.005

Mohs Hardness

Mohs Hardness: 6.5 – 7.5
1 Soft10 Hard

Crystal System

a b c Tetragonal a = b ≠ c, α = β = γ = 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Starlite

Starlite is a trade name for heat-treated blue zircon, once the most fashionable blue gem of the early 20th century before the rise of blue topaz and aquamarine. The blue color is produced by carefully heating brownish or reddish zircon from Cambodia and Sri Lanka, which converts it to a brilliant electric blue with strong fire and double refraction. Its high brilliance and unique vintage associations make starlite a fascinating historical gem still appreciated by collectors.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Starlite?
Starlite is a trade name for heat-treated blue zircon, once the most fashionable blue gem of the early 20th century before the rise of blue topaz and aquamarine. The blue color is produced by carefully heating brownish or reddish zircon from Cambodia and Sri Lanka, which converts it to a brilliant e
What is the hardness of Starlite?
Starlite has a Mohs hardness of 6.5 to 7.5, making it moderate for use in jewelry.
What color is Starlite?
Starlite is primarily Various.
How much does Starlite cost?
Starlite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Starlite?
Starlite belongs to the Tetragonal crystal system.

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