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nctc鑽石的切工等級怎麼看

發布時間: 2025-03-29 02:29:10

Ⅰ 周大福鑽戒的切工怎麼看

切工你可以根據證書上的台寬比 亭深比的數值來判斷 切工的等級是這個數字在某一個等級范圍內來劃分的 一般證書上都會有的

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