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Chemical composition -- Zirconium silicate.

Color-- Colorless, blue, yellow, green, red, brown, orange.

Optics -- R.I. 1.78-2.01.

Durability -- Hardness 6-7.5.

Crystal structure -- Tetragonal.

Specific Gravity -- 3.9-4.8.

Sources -- Sri Lanka (Ceylon), Burma, Thailand, Australia, Cambodia.

Zircon , when properly cut, produces lively, brilliant gems. Before the advent of manmade diamond simulants, colorless zircon was often used as a substitute for diamond . Large, fine zircons are scarce. Reddish-brown stones are often heat-treated to produce blue, colorless, and golden yellow, and the color change is stable.

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