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[会议论文] 作者：Lore Kiefert,Pierre Hardy,Tewodros Sintayehu,G()Woldetinsae,Begosew Abate,
来源：2015中国珠宝首饰学术交流会 年份：2015
Opal was first found in Ethiopia in the early 1990s.Spe() from Mezezo in the historical Shewa province consist of no()ules of a reddish brown volcanie rock with orange.reddish brown.or"chocolate"brown...
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