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Gemmology is the study of precious and semi-precious stones and their properties

Gemstone is a type of watch material that is composed of natural minerals and rocks

The Geneva Seal (also known as the Poinçon de Genève) is an independent certification mark that is used to authenticate the quality of Swiss-made watches

GIA (Gemological Institute of America) is a leading authority on diamond and gemstone certification

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Gilding is a watchmaking technique used to add a layer of gold or gold alloy to a watch component

A girdle is a type of watch band or bracelet that wraps around the wrist and tapers to a narrow width at the sides of the watch case

GMT, or Greenwich Mean Time, is a timekeeping standard used around the world

Gnomon is a watch term referring to the upright post or rod that is used to cast a shadow onto the dial of a sundial

Gold Filled is a type of watch that has a base metal core with a thick outer layer of gold bonded to it