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In 1837 Gaudin made the first synthetic rubies by fusing alumina at a high temperature with a little chromium as a pigment by fusing BaF2 and Al2O3 with a little chromium at temperatures above 2000C.

Synthetic corundum is being used widely in Jewelry designs. They are very hard that only comparable the hardness with only a few substances on the Earth.
Synthetic Corundum is the most famous from the above category. These stones have a Mohs hardness rating of 9, which is comparable to the diamond hardness rating of 10.

With all the above, synthetic corundum have now become a favorite to most of people use to substitute for Precious Gems Stone in the world.



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