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custom necklace wholesale Where are rubies and sapphires among gems?

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According to data from Hong Kong and Taiwan, China: In the international jewelry market, the price of high-quality rubies weighing more than 10ct is more than twice that of the best diamonds or emeralds. The chemical composition of ruby ​​and sapphire is aluminum oxide (AI. 0,), which should be colorless when pure. But in nature, completely transparent and colorless sapphires are rare. On the contrary, corundum minerals often show different colors due to the trace amounts of pigment ions. De exemplu, chromium is red, iron is green or yellow, and titanium and iron are blue. When the content of the same kind of pigment ion is different, its appearance and depth are different. Take rubies as an example: the general content of chromium oxide in rubies is O, 1》6-3%; the content of chromium oxide in deep red and slightly transparent rubies can reach 4%, while the high-quality varieties of Burmese “pigeon blood red” rubies contain Chromium oxide is 2%. The chemical properties of red and sapphire are stable and will not change for a long time in the air. The melting point is as high as 2 050℃, and it is insoluble in acid. Which countries are rich in red and sapphire in the world? The main countries producing rubies, star red and sapphires in the world are Myanmar, Sri Lanka and Thailand; the main countries producing sapphires are Australia, Thailand, Myanmar, Sri Lanka, Cambodia and China. În plus, in Montana in the United States and Kashmir in India, as well as Kenya and Tanzania in Africa, there are also many mines that produce rubies and sapphires.

 

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