Quality Guide

sizes chart
GIA 4Cs
Gold Purity​

Size Chart

diameter, mm
circumference, mm
EU
RU
JP
US
UK
13.0
40.8
41
41
1
1.75
C½
13.5
42.4
42
42
2
2.25
D½
14.0
44.0
44
44
4
3.0
F
14.5
45.6
46
46
6
3.5
G
15.0
47.1
47
47
7
4.25
H½
15.5
48.7
49
49
9
4.75
I½
16.0
50.3
50
50
10
5.5
J½
16.5
51.8
52
52
12
6.0
L
17.0
53.4
53
53
13
6.5
M
17.5
55.0
55
55
15
7.25
N½
18.0
56.5
57
57
17
7.75
O½
18.5
58.1
58
58
18
8.5
Q
19.0
59.7
60
60
20
9.0
R
19.5
61.3
61
61
21
9.75
S½
20.0
62.8
63
63
23
10.25
T½
20.5
64.4
64
64
24
11.0
V
21
66.0
66
66
26
11.5
W
21.5
67.5
68
68
28
12.25
X½
22.00
69.1
69
69
29
12.75
Y½
22.5
70.7
71
71
31
13.5
Z½
23.0
72.3
72
72
32
14.0
Z+2
23.5
73.8
74
74
34
14.5
Z+3
24.0
75.4
75
75
35
15.25
Z+4½
24.5
77.0
77
77
37
15.75
Z+5½
25.0
78.5
79
79
39
16.5
Z+6

GIA 4Cs

GIA Color Scale
colorless
D
E
F
near colorless
G
H
I
J
faint
K
L
M
Very light
N
O
P
Q
R
Light
S
T
U
V
W
X
Y
Z
GIA Clarity Scale
flawless
internally
flawless
Very very
slightly included
VVS1
VVS2
Very
slightly included
VS1
VS2
slightly included
SI1
SI2
included
I1
I2
I3
gia cut scale
excellent
very good
good
fair
poor
Carat weight
Diamonds and other gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the same weight as a paperclip. (Don’t confuse carat with karat, as in “18K gold,” which refers to gold purity.)
Just as a dollar is divided into 100 pennies, a carat is divided into 100 points. For example, a 50-point diamond weighs 0.50 carats. But two diamonds of equal weight can have very different values depending on the other members of the Four C’s: clarity, color and cut. The majority of diamonds used in fine jewelry weigh one carat or less.
Source: Gemological Institute of America (GIA)

Gold Purity

‘Caratage’ is the measurement of purity of gold alloyed with other metals. 24 carat is pure gold with no other metals. Lower caratages contain less gold; 18 carat gold contains 75 per cent gold and 25 per cent other metals, often copper or silver.
Fineness is another way of expressing the precious metal content of gold jewellery, and represents the purity in parts per thousand. When stamped on jewellery, usually this is stated without the decimal point.

The following are the common standards of fineness that are used – .585 (.583) = 14 carat (14K) and .750 = 18 carat (18K).

Source: Gold World Council

Stay Inspired:
Be the First to Discover​