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 Weight | Abbreviation | Comparisons | ||
|---|---|---|---|---|
| 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 |