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This Table may be useful in converting Millimeters (mm) to inches (in)
mm
inches
1 mm
0.04
2
.08
3
0.12
4
0.16
5
0.2
6
0.24
7
0.28
8
0.31
9
0.35
10
0.39
11
0.43
12
0.47
13
0.51
14
0.55
15
0.59
16
0.63
20
0.79
25
0.98
30
1.18
To calculate what percentage of your jewelry is pure precious metal, use the following table:
24K
99.9% Pure Metal (usually Gold or Silver but may be Platinum)
14K
58.3% Pure Metal (usually Gold or Silver but may be Platinum)
10K
42% Pure Metal (usually Gold or Silver but may be Platinum)
PLAT
950 is a stamp for Platinum. Platinum may also be stamped with the word Plat.
925
Sterling silver is usually stamped 925 for .925 Silver content. Sterling silver is also made with .950 silver content and is then stamped 950.
Conversion formulas:To convert inches to millimeters: multiply the inches by 25.4 eg 1 inch = 25.4 mmTo convert millimeters to inches: multiply the mm by 0.04. ie 1 mm = 0.04 inches
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