Troy Ounce
The troy ounce is the basic unit of weight used to measure gold.
1 troy ounce (t oz or oz t) = 31.1034 grams (g)
1 pennyweight (dwt) = 1.5552 grams (g)
1 troy ounce (t oz or oz t) = 480 grains (gr)
(Be careful as the everyday U.S. “avoirdupois” ounce is only 28.3495 grams!)