146-147 / 160
146
147
C U T
Too Deep
Ideal
Too Shallow
Round Brilliant
Round
Modified Brilliant
Oval
Marquise/Navetle
Pear/Drop
Heart
Trillion
Step
Emerald
Baguette
D I A MO N D A N AT O MY
Diameter
table
crown
girdle
pavillion
Mixed
Radiant
Princess
Other
Asscher
Rose
(profile)
Old European
(profile)
Cushion
Old Mine
(profile)
COLOUR
E
F
G
H
I
J
K
L
M N
O
P
Q
R
S-Z
D
CLARITY
FL IF
Flawless, Internally
flawless
VVS
1
VVS
2
Very, very
slightly included
VS
1
VS
2
Very
slightly included
SI
1
SI
2
Slightly included
I
1
Included
I
2
Included
I
3
Included
CARAT
0.01 carat
1.35 mm
0.02 carat
1.70 mm
0.03 carat
2.00 mm
0.05 carat
2.40 mm
0.10 carat
3.00 mm
0.15 carat
3.40 mm
0.20 carat
3.80 mm
0.25 carat
4.10 mm
0.30 carat
4.40 mm
0.40 carat
4.70 mm
0.50 carat
5.00 mm
0.75 carat
5.80 mm
1.00 carat
6.50 mm
2.00 carat
8.20 mm
3.00 carat
9.50 mm
4.00 carat
10.50 mm
RING SIZES
DIAMOND GUIDE
AMERICAN ENGLISH
METRIC (mm)
½
A
37.8252
¾
A½
38.4237
1
B
39.0222
1¼
B½
39.6207
1½
C
40.2192
1¾
C½
40.8177
2
D
41.4162
2¼
D½
42.0147
2½
E
42.6132
2¾
E½
43.2117
3
F
43.8102
3¼
F½
44.4087
3¼
G
45.0072
3½
G½
45.6057
3¾
H
46.2042
4
H½
46.8027
4¼
I
47.4012
4½
I½
47.9997
4¾
J
48.5982
5
J½
49.1967
5¼
K
49.7952
5½
K½
50.3937
5¾
L
50.9922
6
L½
51.5907
6¼
M
52.1892
6½
M½
52.7877
AMERICAN ENGLISH
METRIC (mm)
6¾
N
53-4660
7
N½
54.1044
7
O
54.7428
7¼
O½
55.3812
7½
P
56.0196
7¾
P½
56.6580
8
Q
57.2964
8¼
Q½
57.9348
8½
R
58.5732
8¾
R½
59.2116
9
S
59.8500
9¼
S½
60-4884
9½
T
61.1268
9¾
T½
61.7652
10
U
62.4026
1O¼
U½
63.0420
1O½
V
63.6804
1O¾
V½
64.3188
11
W
64.8774
11¼
W½
65.4759
11½
X
66.0744
11¾
X½
66.6729
12
Y
67.2714
12¼
Y½
67.8699
12½
Z
68.4684