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wood prints amethyst wood prints ametrine wood prints citrine wood prints cut wood prints emerald cut wood prints faceted wood prints facets wood prints gem wood prints gems wood prints gemstones wood prints geology wood prints jewel wood prints mineralogy wood prints polished wood prints quartz wood prints

photographs amethyst photos ametrine photos citrine photos cut photos emerald cut photos faceted photos facets photos gem photos gems photos gemstones photos geology photos jewel photos mineralogy photos polished photos quartz photos

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Quartz, silicon oxide (silica), is one of the most abundant and ubiquitous minerals in the earth's crust. It is the primary constituent of beach sand and occurs in many colors, all of which are used as gemstones. Amethyst, the most valuable, is the purple variety, and citrine is the yellow or orange variety. The stone pictured is from Uruguay, where a unique occurrence produces transparent quartz that is color zoned from purple to yellow-orange. Gems cut from the material around the plane of the color change can display both hues, and are termed 'ametrine'.