鑽石磨工是對鑽石光彩最重要一環，有好多鑽石磨工都會減小打磨時間減低成本。
做得不好會有磨損、刮花、缺口的，所以各位買鑽石時要注意。
以下是評級標準：
EX or E - Excellent, Flawless at 10 power 完美評級在十倍放大後
VG or VGD - Very Good, Extremely difficult to locate under 10
power 非好評級在十倍放大後
GD, GO, G - Good, Very difficult to see under 10 power 好評級在十倍放大後
F, FR, FA - Fair, Noticeable under 10 power 一般評級在十倍放大後
PR, PO, P - Poor, Easy to see under 10X / Visible to unaided
eye 差評級在十倍放大後或肉眼可見
VP, VE, - Very Poor, Relatively easy to see with the unaided
eye 非常差評級、肉眼可見
EX or EP - Extremely Poor, Obvious to see with unaided eye 非常非常差評級、顯著、肉眼可見
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