Size Charts & Terms
The metric syetem is the standard conversion for jewelry making. Most jewelry
making is measured in millimeters (mm).

Below is a conversion from millimeters to inches

6mm is around the size of a
pencil eraser

The size of a dime is 17.9mm,
thats almost 18mm

The size of a quarter is
24.2mm, thats almost an inch

Use a caliper to measure the
size of your gemstone