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Precious stones --- Precious stones. --- Gemmological Association of Great Britain (1938-1990) --- Gemmological Association and Gem Testing Laboratory of Great Britain --- Gemmological Association of Great Britain (2007- ) --- Gem minerals --- Gemstones --- Jewels --- Semi-precious stones --- Stones, Precious --- Minerals --- Gemology --- Gems --- Gem-A --- Gemmological Association of Great Britain (1990-2007) --- Gem-A (Gemmological Association and Gem Testing Laboratory of Great Britain) --- GA (Gemmological Association of Great Britain : 1938-1990) --- Gemmological Association of Great Britain --- National Association of Goldsmiths (Great Britain). --- National Association of Goldsmiths (Great Britain) --- Gemmological Association --- Gemmological Association and Gem Testing Laboratory of Great Britain.