Thursday, November 09, 2006

Gold weights and equivalents and Karat fine

I have had several requests for a more expanded weights table for gold so that you can convert the values more easily. This table shows gold's specific gravity to be 19.3, but you can find any number of resources that will quote it as 19.1, also. The conversion of gold troy weights to gold auvoidupois can be very confusing and this table should help you do that more easily. An ounce in ordinary weights is about 2 Tablespoons. Also included is the Karat system of purity for gold usually used in jewelry, but also used in raw gold weight to determine price according to what impurities are running with the gold. You know, that nasty stuff like silver, copper and lead.

Gold

• The chemical symbol for gold is Au.
• Gold’s atomic number is 79 and its atomic weight
is 196.967.
• Gold melts at 1064.43° Centigrade
• 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 = 480 grains
1 troy ounce = 31.1 grams
15.1 grains = 1 gram
1 gram = .03215 troy ounces
1000 troy ounces = 31.3 kilograms
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
(the Karat system = purity
the carat system = gem weight)

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
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