條件:以肉眼觀察不會發現明顯瑕疵(例如黑色碳點,或整體鑽石有白濛感覺。)。最好選擇顯白色的瑕疵,因為白色瑕疵大多時候都可以「隱藏」起來。 – Karl Knechtel Commented Jan 31, 2022 at 15:20 dear @KarlKnechtel It doesn't answer this question directly that is true, but it is good for SEO for Stackoverflow if someone having this issue but isn't able to form the right question but only mention... https://troymtuad.fitnell.com/71877307/alles-über-購買b2證書