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How to know your ring size
Measure the inner circumference of a ring in your desired size and match the result to the ring size.
| Circum-ference mm |
Diameter |
Canada/ |
UK/ |
Asia | Switz. |
|
46.8 |
14.9 |
4 | H | 7 | |
| 47.4 |
15.1 |
|
H 1/2 |
7 3/4 | |
|
48 |
15.3 |
4 1/2 |
I |
8 | |
|
48.7 |
15.5 |
|
J |
9 | |
|
49.3 |
15.7 |
5 |
J 1/2 |
9 | |
|
50.0 |
15.9 |
|
K |
10 | |
|
50.6 |
16.1 |
5 1/2 |
K 1/2 |
10 | |
|
51.2 |
16.3 |
|
L |
11 3/4 | |
|
51.9 |
16.5 |
6 |
L 1/2 |
11 | 12 3/4 |
|
52.5 |
16.7 |
|
M |
12 | |
|
53.1 |
16.9 |
6 1/2 |
M 1/2 |
13 | 14 |
|
53.8 |
17.1 |
|
N |
||
|
54.4 |
17.3 |
7 |
N 1/2 |
14 | 15 1/4 |
|
55.1 |
17.5 |
|
O |
||
|
55.7 |
17.7 |
7 1/2 |
O 1/2 |
15 | 16 1/2 |
|
56.3 |
17.9 |
|
P |
||
|
57.0 |
18.1 |
8 |
P 1/2 |
16 | 17 3/4 |
|
57.6 |
18.3 |
|
Q |
||
|
58.3 |
18.5 |
8 1/2 |
Q 1/2 |
17 | |
|
58.9 |
18.8 |
|
R |
19 |
|
|
59.5 |
19.0 |
9 |
R 1/2 |
18 |
|
|
60.2 |
19.2 |
S |
20 1/4 |
||
|
60.8 |
19.4 |
9 1/2 |
S 1/2 |
19 |
|
|
61.4 |
19.6 |
T |
21 1/2 |
||
|
62.1 |
19.8 |
10 |
T 1/2 |
20 |
|
|
63.4 |
20.2 |
10 1/2 |
U 1/2 |
22 |
22 3/4 |
|
64.0 |
20.4 | V | |||
|
64.6 |
20.6 | 11 | V 1/2 | 23 | |
|
65.3 |
20.8 | W | 25 | ||
|
65.9 |
21.0 | 11 1/2 | W 1/2 | 24 | |
|
66.6 |
21.2 | X | |||
|
67.2 |
21.4 | 12 | X 1/2 | 25 | 27 1/2 |
|
67.8 |
21.6 | Y | |||
|
68.5 |
21.8 | 12 1/2 | Z | 26 | 28 3/4 |
|
69.1 |
22.0 | Z 1/2 | |||
|
69.7 |
22.2 | 13 | 27 |
The four Cs of a diamond
When buying a diamond, you'll want to know how it's valued. A small flawless stone can be worth the same as a larger diamond with somewhat less clarity. Cut, Clarity, Carat, and Colour are the four Cs that make a diamond unique.
Cut
The shape of a diamond's cut and its number of facets is what makes it sparkle. More facets mean more sparkle. The most common shape and cut is the round brilliant, with 57 facets. Other popular cuts include the rectangular emerald (44 facets), the square princess (50 or 58 facets), the oval (56 facets), the slender marquise (58 facets), and the hybrid pear (58 facets).
Clarity
The purity and flawlessness of a diamond gives it its brilliance. Internal flaws are referred to as inclusions, while external ones are called blemishes. The standard clarity scale ranges from FL (flawless) to VVS (very, very slightly included) to SI (slightly included) to I (included).
Carat
Carat is the measurement unit used for a diamond's weight, with one metric carat weighing 200 milligrams. Diamonds that are fractionally more or less than a carat are expressed in decimals, as in a 1.25ct diamond. Since larger stones more rare, the price per carat increases with the diamond's size.
Colour
Although we appreciate white, or colourless, diamonds for their absence of colour, a "fancy" diamond's hue and intensity of colour can make a major impact on it's quality and price. White diamonds are rated on a scale from D – extremely clear, allowing the best refraction of light – to Z with varying levels of chocolate, champagne, or yellow. When the yellow hue or other colours become intense, beyond a Z rating, they are know as "fancy". Saturated reds, pinks, blues, and greens are the most rare.