Sunday, November 20, 2011
Gold Weight
10:02 AM | 
Posted by
bayan |
Troy Ounce
One Troy ounce of gold weighs 31.1035 grams.
One ounce of gold is accepted to mean 31.1 grams of pure 24 carat gold although in reality it is likely to be 0.9999% pure, often called four nines.
Imperial ounces, equivalent to 28 grams, are not used.
Gold Content
A carat is both a unit of weight and also an indication of fineness, that is, a value for the percentage of pure gold content. 24 carat gold represents 100% gold with no alloy content.
Example:
A one ounce, 1 (Troy) ounce, 9ct gold bracelet weighs 31.1gms.
Actual gold content is (9/24)*31.1=11.66gms of pure (24ct) gold. This also means that (31.10-11.66) 19.44 gms in every troy ounce are other alloys. These alloys, like silver and copper, give rise to the qualities of the metal such as colour and hardness.
| Metal: | Parts Per Thousand | Gold Content/Troy oz |
| 9ct gold | 375 | 11.66 gms |
| 14ct gold | 585 | 18.14 gms |
| 18ct gold | 750 | 23.33 gms |
| 22ct gold | 916 | 28.51 gms |
| 99% pure gold | 990 | 30.79 gms |
| 99.9% pure gold | 999 | 31.07 gms |
| 24ct 100% pure gold | 1000 | 31.104 gms |
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