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Standard Weights, Measures, and Temperatures For Jewelers

Measurements

Fluid Meaurement

• 1 quart = 32 ounces (fluid) = 2 pints = 1/4 gallon = 57 cubic inches
• 1 gallon = 4 quarts = 128 ounces (fluid) = 3.78 litre and 231 cubic inches = 0.134 cubic feet
• 1 litre = 1,000 cc (slightly more than 1 quart U.S.) = 0.264 U.S. gallons
• 1 cubic foot = 7.481 U.S. gallons = 1,728 cubic inches
• 1 imperial gallon = 1.2 U.S. gallons = 4.59 litre = 277.27 cubic inches

Douzieme Gauge
The douzieme gauge used by watchmakers and sometimes by jewelers is also called a spring gauge and degree gauge. Douzieme in French means 1/12.

• 1 douzieme = 1/12 ligne (or line) = 0.0074” = 0.188mm
• 1 ligne = 12 douzieme = 0.0888” = 2.256mm

Length Conversion

1 inch = 25.4 millimetres
1 millimetre = 0.0393 inch
1 metre = 1,000,000 microns
1 micron = 0.000039 inch

Area and Volume Conversion

Rules Relating to Circles

• The circumference of a circle is the diameter x 3.1416.
• The diameter of a circle is the circumference multiplied by .31831.
• The area of a circle is the diameter x itself x .7854.
• A circle is .7854 times as heavy as a square of the same size. The loss in cutting a circle from a square is .2146 of the weight of the square.

Stone Conversions

Peripheral or Surface Speed
(in Feet/Min)

Fineness of Gold (Karats)

Wire and Drill Sizes

Ring Size

File Teeth Count
Teeth Count by Size Number on Files Used by Jewelers
00 = coarsest; 6 = finest

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