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顏色 GIA
(Gemological Institute of America)
AGS
(American Gem Society)
HRD
(Hoge Raad voor Diamnt)
無色
Colorless
D 0 Exceptional White+
E 0.5 Exceptional White
F 1.0 Rare White+
近乎無色
Near Colorless
G 1.5 Rare White
H 2.0 White
I 2.5 Slightly Tinted White
J 3.0
微黃色
Faint Yellow
K 3.5 Tinted White
L 4.0
M 4.5 Tinted Colour
很淡黃色
Very Light Yellow
N 5.0
O 5.5
P 6.0
Q 6.5
R 7.0
淡黃色
Light Yellow
S 7.5
T 8.0
U 8.5
V 9.0
W 10
X
Y
Z

淨度 GIA
(Gemological Institute of America)
AGS
(American Gem Society)
HRD
(Hoge Raad voor Diamnt)
無瑕級
Flawless
FL 0 Loupe Clean
內無瑕級
Internally Flawless
IF
極輕微內含級
Very Very Slightly Included
VVS1 1 VVS1
VVS2 2 VVS2
輕微內含級
Very Slightly Included
VS1 3 VS1
VS2 4 VS2
微內含級
Slightly Included
SI1 5 SI1
SI2 6 SI2
內含級
Included
I1 7 P1
I2 8 P2
9
I3 10 P3