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Звание дипломированного Геммолога вместе с всемирно признанным дипломом "G.G." Константин Крюков обрел в 16 лет.

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Established in 1931, GIA is the world's largest and most respected nonprofit institute of gemological research and learning. The Institute is home to the prestigious Graduate Gemologist (G.G.) diploma. The distinguished G.G. designation at the end of an individual's name is instantly recognized around the world as the mark of a senior professional in the jewlery industry.