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GIA(米国宝石学会)とは？

皆さんも一度は聞いたことのある世界共通のダイヤモンド鑑定基準 “4C” 、実は、GIAが考案・開発したのです！ GIAとは、”Gemological Institute Of America” の略で、日本語で米国宝石学会となります。 1931年にア […]