The jewelry industry uses millimeters to describe most everything. From the measurements of diamonds and gemstones to the width of wedding bands and chains. If you’re not familiar with the metric system this can make shopping for these items, especially online, more difficult.

Here’s a handy conversion chart that should help you out.

Millimeter Conversion Chart

1/8 Inch = 3.175 mm

1/4 Inch = 6.35 mm
US Dime = 17.80 mm

1/2 Inch = 12.70 mm
US Penny = 19.00 mm

1 Inch = 25.40 mm
US Nickle = 21.20 mm

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