Troy ounces to the Avoirdupois ounce. If it helps, a Troy ounce weighs 31.1033 grams, while an Avoirdupois ounce weighs 28.3495 grams. A Troy pound weighs 373.2396 grams, and an Avoirdupois pound weighs 453.592 grams. Finally, precious metals are also measured by the pennyweight, which is abbreviated as dwt, and by grains. There are 20 pennyweights or 480 grains in a Troy ounce.
Gold comes in several forms in jewelry.
Gold-filled refers to metal, usually brass, to which gold has been mechanically bonded and is measured in terms of the proportion of gold to other metals and the karatage of the gold. Gold-plate refers to metal to which gold has been applied by various means. Electroplating is the transference of gold to the surface of other metals by electrical action. Plated gold is generally thinner and less durable than filled gold. Silver also comes in several forms in jewelry.