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Gota de Aceite（ゴータ・デ・アセイテイ）: 最高級コロンビア産エメラルドの名称 (英語)
The finest and rarest emeralds are sometimes said to have an optical effect called gota de aceite.
ザンビアのカフブ地方産のエメラルド (英語)
Zambia is considered the world’s second most important source of emeralds by value (after Colombia).
コスクエス鉱山：コロンビア産エメラルドの主要原産地 (英語)
The Coscuez mine, one of a number in Colombia, is rapidly gaining significance as a major source of fine emeralds.
The Oil Treatment of Emeralds in Bogotá, Colombia
This article focuses on Colombian emeralds and gives a detailed explanation of the oiling process as observed by the author.
コロンビアのエメラルド (英語)
A comprehensive review of the history and geology of Colombian emeralds together with descriptions of some of the most famous gems to come from this locality.
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