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Heat Treating the Sapphires of Rock Creek, Montana (英語)
Renewed interest in large-scale commercial mining of Montana sapphires motivated a detailed study of the heat treatment of sapphire from the Rock Creek deposit.
拡散処理されたコランダムの最新情報：赤および他の色 (英語)
Blue diffusion-treated sapphires have become a subject of considerable controversy since their introduction in significant quantities a few years ago.
モゴックストーントラクトにおけるルビーおよびサファイア採鉱の状況 (英語)
Burma, now named Myanmar, has for centuries been considered the world's preeminent source of fine rubies.
タイのChanthaburi-Trat（チャンタブリ‐トラット）宝石鉱山 (英語)
Thailand has become the world's major source of gem ruby.
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