The Beauty and Vigour of Colored Gemstones

Gemstones come in a variety of shapes, colors and sizes. They are naturally occurring crystalline forms of some minerals. Precious and semi-precious stones used in jewelry making are specially cut and polished. Some beautiful rocks are also used to make attractive jewelry articles but they are not considered precious gems. The value of a stone is determined by a few factors including its hardness, luster and rarity. Many stones are naturally transparent; however, inclusions of fibrous minerals sometimes make them opaque. The value of diamonds is not measured in the same manner. Almost all stones are graded using the naked eye with the exception of diamond. ...

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