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All婚約指輪ダイヤモンドの4Cラボグロウンダイヤモンドセレブの婚約指輪NEWS
ダイヤモンドの大きさ比較

Complete Guide to Diamond Size: 0.3 to 3 Carat Diamonds: Diameter, Appearance, and How to Choose

ダイヤモンドのカラット

What is the Carat Count of an Engagement Ring? A Complete Explanation of the Relationship Between Size and Price
GIA鑑定書

Do I need a diamond certificate? Here's why it's important for accurate information and reliability
ダイヤモンドルース

[Diamond Cut] The Most Important Factor That Affects Sparkle
GIA（Gemological Institute Of America）のロゴ

What is GIA, a diamond appraisal agency?