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Along with the emerald and sapphire, ruby is one of the most prized colored gems available. The main quality of the ruby is its bright red color. The most valuable color is a dark true red without pink or purplish tones. The deeper the color, the more valuable it is. The best color usually comes from Burma and is very costly. Stones from Thailand are darker but clearer and much more common. Only red stones are called rubies. If the color is too light to be called red, it is a pink sapphire.

Ruby is the red variety of corundum. Corundum, the main material of ruby, is the second-hardest material known after diamond. In gem quality, rubies over 2 carats can be more costly than a diamond. Corundum rates 9 on the Mohs scale, but there is a 140 times difference between corundum and diamond.

Inclusions and flaws are fairly common, and many rubies are treated to enhance their color. In general, one should look for a bright red stone with as few inclusions as possible. Synthetic rubies offer good color, clarity and size and are more affordable.

Rubies were the most valuable gemstones in ancient Southeast Asia, where they are found. A fine ruby had all sorts of magical powers. Its color was thought to come from an undying flame inside the stone or, in some legends, from a piece of the planet Mars, and it allowed its owner to live in safety, even in the midst of enemies. It was believed to bring its owner all kinds of protection and to stop bleeding. In Burma, it could make one invincible - as long as it was embedded in the skin. In more modern times, rubies are the symbol of love and passion.

Ruby is July's birthstone.


Color Various shades of red Ruby
Description Corundum (aluminum oxide), the same family as sapphire, with the color coming from chromium. Mohs' hardness rating of 9.

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