FeatureGems & Gemology, Fall 1983, Vol. 19, No. 3

哥伦比亚波哥大祖母绿的注油处理 (英语)

Ron Ringsrud

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コロンビアのボゴタ産エメラルドのオイル処理 | Gems & Gemology（宝石と宝石学）