古董垫形钻石图鉴
通过 Imperial Cushions 图鉴比较古董垫形和老矿切割钻石的轮廓、比例与刻面个性。
Read the guideDiamond knowledge
古董钻石专业指南
以中文了解古董钻石证书、品相、老矿垫形比例、大克拉购买及钻石图鉴。
Guide section
Understand the cuts
Learn the main shapes, facet patterns and visual differences before comparing individual stones.
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Compare cut and character
Use these guides to compare proportions, light behaviour and the differences between historic cutting families.
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Check reports and condition
Read the grading report beside photographs, movement videos and a detailed condition examination.
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Plan a purchase or setting
Work through the decisions that matter when buying a large stone, choosing a setting, matching a pair or considering natural colour.
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Ask about a particular stone.
Tell us what you are comparing or collecting. We will answer in the context of real available material.