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| Millimeters | Inches | Inches |
| 1 | 1/32" | .0394 |
| 2 | 1/16" | .0787 |
| 3 | 1/8" | .1181 |
| 4 | 5/32" | .1575 |
| 5 | 3/16" | .1968 |
| 6 | 1/4" | .2362 |
| 7 | 9/32" | .2756 |
| 8 | 5/16" | .3150 |
| 9 | 11/32" | .3543 |
| 10 | 3/8" | .3937 |
| 11 | 7/16" | .4331 |
| 12 | 15/32" | .4724 |
| 13 | 1/2" | .5122 |
| 14 | 9/16" | .5512 |
| 15 | 19/32" | .5910 |
| 16 | 5/8" | .6299 |
| 17 | 11/16" | .6698 |
| 18 | 23/32" | .7087 |
| 19 | 3/4" | .7486 |
| 20 | 24/32" | .7874 |
| 24 | 30/32" | .9449 |
| 28 | 1 1/8" | 1.1024 |
| 30 | 1 3/16" | 1.1811 |
| Please Note: 1 inch = 25.4mm | ||
Convert Millimeters to Inches
The jewelry industry has some standard sizes 40x30mm, 25x18mm, 18x13mm, 14x10mm, 35mm round, 15mm round etc. there are others but these are some
common ones. Note everything is in millimeters. You'll need to measure your cabochons if you don't know their size. The charts below will assist you
in measurement conversion. Simply take the number of millimeters and divide by 25.4. You will then get a decimal that can be converted to an inch.
Example: 40 millimeters is approximately 1.6 inches, calculated as 40 / 25.4 = 1.57 inch.
(The following chart demonstrates common conversions for easy reference:)
| Millimeters | Inches |
| 34 Millimeters | 1.34 Inches |
| 35 Millimeters | 1.38 Inches |
| 36 Millimeters | 1.42 Inches |
| 37 Millimeters | 1.46 Inches |
| 38 Millimeters | 1.50 Inches |
| 39 Millimeters | 1.54 Inches |
| 40 Millimeters | 1.57 Inches |
Millimeter measurements are rounded off to the nearest 10th. Gemstones are measured from all the way across the gemstone, from one end to the other, otherwise called a gem's diameter. You may also measure cabochons/cameos at the widest, longest and thickest points.
Convert Gauges to Millimeters and Inches
| Gauge | Inches | Millimeters |
| 0000 | .460 | 11.684 |
| 000 | .410 | 10.404 |
| 00 | .365 | 9.266 |
| 0 | .325 | 8.26 |
| 2 | .257 | 6.54 |
| 4 | .204 | 5.19 |
| 6 | .162 | 4.12 |
| 8 | .128 | 3.26 |
| 10 | .102 | 2.59 |
| 12 | .081 | 2.05 |
| 14 | .064 | 1.63 |
| 16 | .051 | 1.29 |
| 18 | .040 | 1.02 |
| 20 | .032 | .812 |
Millimeters, Inches and Carats
One carat is equal to 200 milligrams. Stones are measured to the nearest hundredth of a carat. A hundredth of a carat is also called a point.
| Millimeters | Inches | Carats | Millimeters | Inches | Carats | |
| 1.0 mm | .039 inch | .005 carat | 4.8 mm | .40 carat | ||
| 1.2 mm | .008 carat | 4.9 mm | .43 carat | |||
| 1.3 mm | .01 carat | 5.0 mm | .197 inch | .47 carat | ||
| 1.5 mm | .015 carat | 5.2 mm | .205 inch | 1/2 carat | ||
| 1.7 mm | .02 carat | 5.4 mm | .60 carat | |||
| 1.8 mm | .025 carat | 5.5 mm | .63 carat | |||
| 2.0 mm | .079 inch | .03 carat | 5.6 mm | .65 carat | ||
| 2.1 mm | .035 carat | 5.8 mm | .228 inch | 3/4 carat | ||
| 2.2 mm | .04 carat | 6.0 mm | .236 inch | .80 carat | ||
| 2.4 mm | .05 carat | 6.2 mm | .85 carat | |||
| 2.5 mm | .06 carat | 6.4 mm | .95 carat | |||
| 2.7 mm | .07 carat | 6.5 mm | .255 inch or 1/4 inch | 1.00 carat | ||
| 2.8 mm | .08 carat | 6.6 mm | 1.10 carat | |||
| 2.9 mm | .09 carat | 6.8 mm | 1.17 carat | |||
| 3.0 mm | .118 inch | 1/10 carat | 7.0 mm | .276 inch | 1-1/4 carat | |
| 3.1 mm | .11 carat | 7.2 mm | 1.33 carat | |||
| 3.2 mm | .125 inch or 1/8 inch | .12 carat | 7.4 mm | .291 inch | 1-1/2 carat | |
| 3.3 mm | .14 carat | 7.6 mm | 1.60 carat | |||
| 3.4 mm | .15 carat | 7.8 mm | .307 inch | 1.75 carat | ||
| 3.5 mm | .16 carat | 8.0 mm | .315 inch | 1.90 carat | ||
| 3.6 mm | .17 carat | 8.2 mm | 323 inch | 2.00 carat | ||
| 3.7 mm | .18 carat | 8.4 mm | 2.15 carat | |||
| 3.8 mm | .150 inch | 1/5 carat | 8.6 mm | .338 inch | 2.25 carat | |
| 3.9 mm | .22 carat | 8.8 mm | .346 inch | 2.50 carat | ||
| 4.0 mm | .158 inch | .23 carat | 9.0 mm | .354 inch | 2.65 carat | |
| 4.1 mm | .162 inch | 1/4 carat | 9.2 mm | 2.85 carat | ||
| 4.2 mm | .30 carat | 9.4 mm | .370 inch | 3.00 carat | ||
| 4.4 mm | .173 inch | .33 carat | 9.6 mm | 3.15 carat | ||
| 4.5 mm | .35 carat | 9.8 mm | 3.35 carat | |||
| 4.6 mm | .181 inch | 1/3 carat | 10.0 mm | .394 inch | 3-1/2 carat |
Quick Carat Conversion Mathematical Formula for Carat to Metric:
1 grain = 0.648 grams
1 carat = 200 milligrams
1 point = 2 milligrams
Ounces to Grams
1 gram [g] = 0.0353 oz * To convert ounces to grams multiply # of ounces by 28.35
| 1 ounce | 28 g |
| 4 ounces or 1/4 pound | 113 g |
| 1/3 pound | 150 g |
| 8 ounces or 1/2 pound | 230 g |
| 2/3 pound | 300 g |
| 12 ounces or 3/4 pound | 340 g |
| 1 pound or 16 ounces | 450 g |
| 2 pounds | 900 g |
