Gold
1 · The chemical symbol for gold is Au.
2· Gold’s atomic number is 79 and its atomic weight
is 196.967.
3· Gold melts at 1064.43° Centigrade
4· The specific gravity of gold is 19.3, meaning gold
weighs 19.3 times more than an equal volume of
water.
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WEIGHT EQUIVALENTS
1 troy ounce = 1,097 ordinary ounces
1 troy ounce = 480 grains
1 troy ounce = 31.1 grams
1000 troy ounces = 31.3 kilograms
1 gram = .03215 troy ounces
1 kilogram = 32.15 troy ounces
1 tonne = 32.150 troy ounces
1 ordinary ounce = .9115 troy ounces
1 ordinary pound = 14.58 troy ounces
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Percent Gold = European System = Karat System
100 % = 1000 fine = 24 karat
91.7 % = 917 fine = 22 karat
75.0 % = 750 fine = 18 karat
58.5 % = 585 fine = 14 karat
41.6 % = 416 fine = 10 karat
More details below:
Weights & Measures
The basic unit of weight used in dealing with gold is the troy ounce. One troy ounce is equivalent to 20 troy pennyweights. In the jewelry industry, the common unit of measure is the pennyweight (dwt.) which is equivalent to 1.555 grams.
1 troy ounce = 31.1034 grams
1 troy ounce = 1.0971 ounce avoirdupois (U.S.)
1 troy ounce = 480 grains
1 kilogram = 32.15 troy ounces
1 metric ton (1,000 kilos) = 32,151 troy ounces
10 tolas (Indian Subcontinent) = 3.75 troy ounces
5 taels (Chinese) = 6.02 troy ounces
Standard Bar Sizes
400 troy ounces (12.5 kilos)
32.15 troy ounces (1 kilo)
100 troy ounces (3.11 kilos)
Also, a wide variety of smaller-sized bars by various manufacturers are not deliverable to any exchange, but trade among makers in smaller markets.
Karat Gold Conversions
24-karat = .995 to .9999 pure (fine) gold
22-karat = .916 pure (fine) gold
18-karat = .750 pure (fine) gold
14-karat = .583 pure (fine) gold
10-karat = .4167 pure (fine) gold
The degree of purity of native gold, bullion (bars or ingots of unrefined gold), and refined gold is stated in terms of gold content. "Fineness" defines gold content in parts per thousand. For example, a gold nugget containing 885 parts of pure gold and 115 parts of other metals, such as silver and copper, would be considered 885-fine. "Karat" indicates the proportion of solid gold in an alloy based on a total of 24 parts. Thus, 14-karat (14K) gold indicates a composition of 14 parts of gold and 10 parts of other metals. Incidentally, 14K gold is commonly used in jewelry manufacture. "Karat" should not be confused with "carat," a unit of weight used for precious stones.
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