Garnet
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Any of a group of semi-precious silicate stones that range in colour from red to green (garnets occur in all colours but blue). Some garnets used as gemstones include pyrope (the deep red garnet), almandine, spessartine, grossular, the iron-aluminum dark red garnet (also known as the carbuncle stone), uvarovite (rare), and the lustrous andradite (which includes the valuable green demantoid garnet, topazolite, and melanite).
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Gear
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A mechanism that transmits motion and force via toothed wheels.
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GMT
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Abbreviation of Greenwich Mean Time. GMT is a term sometimes used to describe a watch which indicates the time simultaneously in the world's different time-zones.
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Gold
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A precious metal that is very soft when pure (24 Kt.). Gold is the most malleable and ductile (able to be made into wire) metal. Gold is alloyed (mixed with other metals, usually silver and copper) to make it less expensive and harder. The purity of gold jewellery is measured in carats.
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Gong
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A tempered metal wire or blade which generates a tone when struck by a hammer. At one end, it is attached to the movement and the remaining length is freely suspended in a curve around the bridges. Sometimes called bell.
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Guilloché
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A style of engraved decoration on metal achieved by an engine-turning lathe with an eccentric motion that can cut a variety of patterns.
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