Heat Treatment
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Definition
The controlled heating of a gemstone to high temperatures to improve or alter its color, clarity, or both, by inducing or dissolving inclusions and changing trace element oxidation states.
Detailed Explanation
宝石を高温に加熱することでインクルージョンの溶解・生成やトレース元素の酸化状態変化を引き起こし、色または透明度を改良する処理方法です。ルビー・サファイアの大多数に施されています。