Ring Size Conversion Table  |  The Mohs Scale Of Hardness  |   Diamond Weight / Diameter Table


Ring Size Conversion Table
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•		 Measure your finger size at the end of the day when your fingers are at their largest
(like sizing shoes).
Don’t measure finger sizes when your hands are cold; let them warm up to room temperature.
The width of a ring is an important factor in determining the right finger size.
A wider ring may require a slightly larger size, because it covers more of your finger.
Wrap a piece of string or a strip of paper around your finger.
Mark the point where the two ends meet.
Measure the string or paper against a ruler to get the circumference of your finger.
Divide that by 3.14 to get the diameter of your finger.
Look up your ring size using the table shown below.
 
INCHES MM HK JAP USA UK FRA GER SWIT
.52 13.21 3 2 2 D 41 ½ 13 ¼ 1 ½
.536 13.61 5 3 2 ½ E 42 ¾ 13 ¾ 2 ¾
.553 14.05 6 4 3 F 44 14 4
5 G 45 ¼ 5 ¼
.569 14.45 7.5 3 ½ 14 ½
6 ½ 3 ¾ H 46 ½ 6 ½
.585 14.86 9 7 4 H ½ 15
4 ¼ I 47 ¾ 7 ¾
.601 15.27 10 8 4 ½ I ½ 15 ¼
J 49 9
.618 15.70 11 9 5 J ½ 15 ¾
K 50 10
.634 16.10 12 5 ½ L 51 ¾ 16 11 ¾
11 L ½
.650 16.51 13 12 6 M 52 ¾ 16 ½ 12 ¾
.666 16.92 14.5 13 6 ½ N 54 17 14
.683 17.35 16 14 7 O 55 ¼ 17 ¼ 15 ¼
.699 17.75 17 15 7 ½ P 56 ½ 17 ¾ 16 ½
.716 18.19 18 16 8 Q 57 ¾ 18 17 ¾
.732 18.59 19 17 8 ½ 18 ½
R 59 19
.748 18.99 20.5 18 9 19
S 60 ¼ 20 ¼
.764 19.41 22 19 90 ½ 19 ½
T 61 ½ 21 ½
.781 19.84 23 20 10 T ½ 20
21 10 ¼ U 62 ¾ 22 ¾
.797 20.24 24 22 10 ½ U ½ 20 ¼
 
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The Mohs Scale Of Hardness
This scale was invented by Austrian mineralogist Friedrich Mohs (1773-1839),
and is used to measure a substance’s hardness. One substance is harder than another
if it can scratch it; for example, a diamond
(ranked 10 out of 10) will scratch a garnet (ranked 6.5-7.5), but not the other way around.
 
     
 
Substance Hardness
Talcum 1
Amber, Fingernails, Ivory, Jet, Shell 2.5
Ametrine, Gold, Fuchsite, Silver, Wulfenite 2 - 3
Bronze, Copper, Coral, Pearl, Limestone 3
Azurite, Dolomite, Sphalerite 3.5 - 4
Iron, Flourite, Marble, Platinum 4
Apatite, Glass 5
Lapis Lazuli 5 - 5.5
Moldavite, Scapolite, Turquoise, Vlasovite 5 - 6
Opal 5.5 - 6.5
Labradorite, Moonstone, Sunstone 6 - 6.5
Diaspore, Peridot 6.5
Jade, Tansanite 6.5 - 7
Agate, Amethyst, Chalcedony, Citrine, Quartz, Steel 7
Garnet, Kunzite, Spessartite, Tsavorite 6.5 - 7.5
Spinel, Zircon 7.5
Aquamarine, Beryl, Emerald, Granite, Morganite 7 - 8
Spinel, Topez 8
Alexandrite, Chrysoberyl 8.5
Ruby, Sapphire 9
Diamond 10
 
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  Diamond Weight / Diameter Table
WEIGHT (CARATS) DIAMETER (MM) SIEVE SIZES
0.0086 1.2 +1.5   -2.5
0.0136 1.4 +4.0   -4.5
0.0188 1.6 +5.5   -6
0.0267 1.8 +6.5   -7
0.035 2.0 +7.5   -8
0.05 2.4 +9.5   -10
0.10 3.0 +12.5   -13
0.20 3.8 +16.5   -17
0.25 4.2 +18.5   -19
0.30 4.4 +19.5   -20
0.40 4.8
0.50 5.2
0.75 5.9
1.00 6.5
1.25 7.0
1.50 7.5
1.75 7.9
2.00 8.2
2.50 8.9
3.00 9.4
3.50 9.9
4.00 10.4
5.00 11.2
6.00 11.9
7.00 12.2
8.00 12.5
9.00 13.1
10.00 13.6
15.00 16.1
20.00 17.7
30.00 20.3
40.00 22.3
50.00 24.1
 
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