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Grain

 The grain measurement, the earliest unit of weight measurement, used a grain of wheat or barleycorn as its standard. It is the smallest unit of measure in the Troy system.

One grain also equals 64.798 of a milligram; 15.432 grains equals a gram.

It is also a unit used to measure pearls and equals 1/4 of a carat.

Grain also refers to cleavage direction in a diamond and patterns of color in an opal.

Troy Weight

Troy WeightAbbreviationComparisons 
Graingn24 gn to 1 dwt
Pennyweightdwt20 dwts to 1 Troy Ounce
Troy Ounceozt12 oz to 1 Troy Pound
Troy Poundlb. t.1 lb. t. = 5,760 gn1 lb. t. = 240 dwt1 lb. t. = 12 ozt