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Gallery - a strip of metal that is pierced with a continuing pattern.
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Gemology - the study of gemstones.
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German Silver - is not really silver at all. It is another name for nickel silver which is an alloy which does not contain any silver at all.
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Girdle - the outer circumference of a polished gemstone that separates the top or crown, from the base, or pavilion.
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Gypsy Setting - a style of setting for securing a gemstone within a circular or oval recess in the body of a ring. In this type of setting the table or large flat surface on the top of the gemstone is level with the metal surface.