Field ReportGems & Gemology, Summer 2016, Vol. 52, No. 2

跟随 Rainier(雷尼尔)的步伐:契沃尔祖母绿矿之旅 (英语)

Robert Weldon, Jose Guillermo Ortiz, and Terri Ottaway

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In Rainier’s Footsteps: Journey to the Chivor Emerald Mine | Gems & Gemology