4Cs
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Definition
The four universally recognized criteria used to evaluate and grade diamonds: Color, Clarity, Cut, and Carat weight.
Detailed Explanation
ダイヤモンドを評価・格付けするために世界共通で認められた4つの基準で、カラー(色)、クラリティ(透明度)、カット(研磨)、カラット重量(質量)を指します。