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.
|Grain||gn||24 gn to 1 dwt|
|Pennyweight||dwt||20 dwts to 1 Troy Ounce|
|Troy Ounce||ozt||12 oz to 1 Troy Pound|
|Troy Pound||lb. t.||1 lb. t. = 5,760 gn||1 lb. t. = 240 dwt||1 lb. t. = 12 ozt|