![]() If the corundum has other impurities to give it other colors, it is called sapphire. It becomes the precious stone when it has a a small impurity of chromic oxide which gives it the rich red color. Ruby is made up of the mineral corundum, which is aluminum oxide (alumina, Al 2O 3). All the samples are on display at the Museum of Natural History. Myanmar (formerly Burma) is the major source of rubies and sapphires.Īt right is the 23.1 carat Carmen Lucia Ruby, mined in the fabled Mogok region of Burma in the 1930s. The bracelet is on display at the Smithsonian Museum of Natural History. ![]() This ruby and diamond bracelet contains 31 matched Burmese rubies with a total of 60 carats. ![]()
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