Catholic Jewelry


Catholic Jewelry

Convert millimeters to inches for jewelry sizes with this online calculator.

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length conversion factors provided by unitconversion.org


Approximate Jewelry Size Chart

  • 12mm = 1/2 inch
  • 15mm = 5/8 Inch
  • 18mm = 3/4 Inch
  • 22mm = 7/8 Inch
  • 25mm = 1 Inch



    U.S. Coin Sizes

  • Dime = 17.9 mm
  • Penny = 19 mm
  • Nickel = 21 mm
  • Quarter = 24 mm


    Jewelry Weight

  • 1 DWT = 1.555 grams
  • 1 DWT = 1/20th of a troy ounce.


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