Ancient Greeks distinguished between precious and semiprecious gems. Only four stones are considered precious: diamond, ruby, sapphire, and emerald. Modern gemologists describe stones based on chemical composition and hardness
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Gemology is a branch of mineralogy dealing with natural and artificial gemstones. First qualifications established in 1908 by NAG Education Committee. First US graduate Gem-A diploma course in 1929 by Robert Shipley. First jewelry trade laboratory opened in London in 1925
Pure diamonds are perfectly transparent and colorless. Diamonds contain impurities and structural defects causing coloration. Most diamonds fall between white and pale yellow/brown. Type I diamonds contain nitrogen, Type II diamonds don't
Professional tool helps determine diamond size on finger. Includes conversion tables for various diamond cuts. Provides weight equivalents for different diamond sizes
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