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: Compare Gemstone Size in mm with US Coins
Comparison Chart of US Currency Coins and mm Size

US Currency Coins Size
1 Cent 1 Cent US 19.05 mm
5 Cents 5 Cents US 21.21 mm
10 Cents 10 Cents US 17.91 mm
25 Cents 25 Cents US 24.26 mm
50 Cents 50 Cents US 30.61 mm
1 Dollar 1 Dollar US 26.50 mm
  • First Published: March-01-2011
  • Last Updated: November-10-2014
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart