The Gemmological Association of Hong Kong

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	Special Announcement

	Contact GAHK The Gemmological Association of Hong Kong Ltd P.O. Box 97711, Tsim Sha Tsui, Kowloon, Hong Kong Tel. (852) 2366-6006 / Fax. : (852) 2153-9673 E-mail : info@gahk.org

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ISSN 2307-3500 (Online), ISSN 2076-7412 (Print): 香港宝石学协会年刊
2023
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