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The weight of a piece of gold helps determine its value. Gold and silver are commonly weighted in the troy system of weights. Troy weight is a system of measurement for precious metals, precious stones etc. where a pound is equivalent to 12 ounces. The name “Troy” is derived from Troyes, France, the city where the system was first used. Avoirdupois is a weight system, utilized by the United States and England, for measuring commodities except precious metals, precious stones and medicines. The unit weight is the pound and is equivalent to 16 ounces. Grams (g) and pennyweights (dwt) are the units of weight most often used in the jewelry and refining industry.

One pound troy = twelve troy ounces

Twenty penny weights = one troy ounce

WEIGHT CONVERSION TABLE

1 gram (g) = 0.643 dwt = 0.0032 oz t = 0.035 oz av
1 pennyweight (dwt) = 1.555 g = 0.05 oz t = 0.055 oz av
1 troy ounce (oz t) = 31.103 g = 20 dwt = 1.097 oz av
1 ounce avoirdupois (oz av) = 28.3495 g = 18.229 dwt = 0.911 oz t


The purity of gold is defined by the terms karat. Gold purity is described by the amount of pure gold in parts per 1000. For example, a gold ring containing 750 fine gold has 750 parts (75.0%) gold and 250 parts (25.0%) of other metals.

GOLD KARAT INFORMATION CHART

US Gold Markings Parts Gold Percent Gold EUR Markings
9 kt 9 /24 37.50% 375
10 kt 10 / 24 41.67% 416
12 kt 12 / 24 50% 500
14 kt 14 / 24 58.33% 583 or 585
18 kt 18 / 24 75% 750
22 kt 22 / 24 91.67% 917
24 kt 24 / 24 99.99% 999 or .99999