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Room D1-8, 12/F Hang Fung Industrial Building Phase 1 2G Hok Yuen Street, Hung Hom, Kowloon Hong Kong
TEL
(852) 2330 2322
FAX
(852) 2364 0032
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Synthetic
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Synthetic Corundum
Mohs Hardness: 9
Specific Gravity: 4
Reflective Index: 1.76-1.77
Crystal structure: Hexagonal Chemical
composition -- Aluminum oxide. After diamond, the next hardest gem
material. Tough, but still subject to chipping and abrasion. Stones
worn regularly in rings will periodically need re-polishing to remove
minor chips and pits.
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Synthetic Spinel
Mohs Hardness: 7.5-8
Specific Gravity: 3.58-3.63
Reflective Index: 1.72
Crystal structure: Isometric (cubic) Chemical composition:
Magnesium aluminate. Color: Red, blue, green, purple, orange, gray,
brown, near colorless. Synthetic Spinel has often been confused with
ruby and sapphire, but it provides many fine gems in its own right.
Some famous large "rubies," such as the Black Prince's Ruby
and the Timur Ruby in the British Crown Jewels are actually spinels.
Fine large stones are rare and expensive, but smaller stones are quite
abundant.
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Synthetic Quartz
Mohs Hardness: 7
Specific Gravity: 2.651- 2.91
Reflective Index: 1.553-1.554
Crystal
structure: Hexagonal Synthetic quartz has been around for decades. In
fact it is the synthetic quartz industry that made quartz watch
movements possible. The sad part about this gem material is what it
has done to the market for fine quality, natural amethyst. The
synthetic so closely emulates the natural, and is very difficult to
distinguish from the natural.
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