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Thanks a lot Cortez. In the meanwhile, I also came across a few more Hanadama Certificates, now by the Pearl Institute Co. Ltd. (株式会社 真珠総合研究所). Which thickens this discussion, I guess.

Hi Folks. New to the forum, first post. Have been devouring the content here, though, and learning quite a lot from you guys. Thanks so much, btw. I have been following some Japanese auctions and came across a lot of Hanadama certificates issued by the Japan Gem Grading Center (GGC). Would...