Organizer : 香港寶石學協會
Topic :   紅寶石、藍寶石主要產地介紹
Date :   2022/08/26 - 2022/08/26
Detail

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- 香港寶石學週年大會通二零二二 (2022/07/08)
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- GAHK 週 年 大 會 通 告2021 (2021/07/14)
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