The name Troy weight is derived from Troyes, France where the system was first implemented. This is a unit of measurement used to weigh precious metals.
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.
- Abbreviation: gn
- 24 gn to 1 dwt
Pennyweight
Pennyweight is a unit of Troy Weight for weighing precious metals.
- Abbreviation: dwt
- 20 dwts to 1 Troy Ounce
Troy Ounce
Troy ounce is a unit of Troy Weight for weighing precious metals.
- Abbreviation: ozt
- 12 oz to 1 Troy Pound
Troy Pound
Troy ounce is a unit of Troy Weight for weighing precious metals.
- Abbreviation: lb. t.
- 1 lb. t. = 5,760 gn
- 1 lb. t. = 240 dwt
- 1 lb. t. = 12 ozt