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Guide to Rubies
| Ruby is a mineral variety of corundum (aluminum corundum) characterized by a red color, which is primarily caused by its chromium content. It is considered as one of the most precious gems in the world together with sapphire, emerald, and the diamond. Natural ruby is rare, thus expensive. Synthetic rubies (also called created rubies) are available, however, for a more affordable price.
Ruby comes from the Latin word ruber, which means “red.” It has a hardness of 9 on the Mohs scale, making it second only to diamond in hardness. It is valued according to color, size, clarity, and cut.
Ruby is usually heated to enhance its color. A ruby that is not heated is considered unusual. Some rubies undergo low tube heat where they are heated over charcoal at about 1,300 degrees Celsius for 20 to 30 minutes
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