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It has hardness of 7.5 Mohs. It is formed of zirconium silicate and its specific gravity is 4.6 - 4.7.
Zircon occurs in a wide range of colors but for many years, the most popular was the colorless variety, which looks more like diamond than any other natural stone due to its brilliance and dispersion. Today the most popular color is blue zircon. Most blue zircon, which is considered an alternate birthstone for December, is a pastel blue, but some exceptional gems have a bright blue color. Zircon is also available in green, dark red, yellow, brown, and orange.
Zircon is one of the heaviest gemstones, which means that it will look smaller than other varieties of the same weight. Zircon jewelry should be stored carefully because although zircon is relatively hard, it can abrade and facets can chip. The wide variety of colors of zircon, its rarity, and its relatively low cost make it a popular collector's stone.
The following varieties of gemstones come under it -
Jargon: Variable
Matura diamond: Colorless
Hyacinth: Yellow, orange, red, brown.
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