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A gemstone usually refers to a rock or mineral that is used in jewelry or as a collector’s item, usually after it has been polished, cut or faceted. Gemstones are classified through several ways. They may be grouped according to chemical composition — for example, rubies are made of aluminum oxide and diamonds are made of carbon. If they are crystals, they may be classified using the crystal system, which divide gemstones into cubic, trigonal or monoclinic.
