JNA Jan 2020

JAN/FEB 2020 ISSUE #419 US$15 2020: A RAY OF HOPE FOR THE JEWELLERY TRADE 珠寶界綻露曙光 From passion to profession 將熱誠轉化成專業 Disruptive technologies shaping the world of gemmology 檢測業的顛覆性科技

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