The minimum fineness is 995 parts per 1000 fine gold and gold said to be 1000 fine is marked down to 999.9 fine. The following fine gold contents of other bar weights are accepted by the London Bullion Market Association (LBMA). These bars are available at the spot Loco-London price plus a premium which varies dependent on prevailing market conditions in different locations.
 
 Fine Gold Contents in Ounces Troy

Gross Weight

Bars of 995.0

Bars of 999.0

Bars of 999.9

1 Kilo

31.990

32.119

32.148

1/2 Kilo

15.995

16.059

16.074

100 Grams

3.199

3.212

3.215

50 Grams

1.600

1.607

1.608

10 Grams

0.321

0.322

0.322

5 Grams

0.161

0.161

0.161

10 Tolas

3.731

3.746

3.75

5 Taels

5.987

6.011

6.017

Sources: London Bullion Market Association, London

 
 Gold Coated Measure
Many gold-coated articles are also used as substitutes for solid karat gold. The thickness of the coatings are often expressed in millionths of an inch, or micro-inches, and the table below provides a way to translate between these and other measurement units.
 
 Thinkness Equlvolents
1 millionth inch (micro-inch) = 0.0254 micron
 
1 thousandth inch (mil) = 25.4 microns
 
1 millionth meter (micron) = 39.37 micro-inches
 
1 millimeter = 39.37 mils
 
 
 Purity Measure
The purity of gold articles is generally described in three ways:

Percent % ( Parts of gold per 100 )

Fineness ( Parts of gold per 1000 )

Karats ( Parts of gold per 24 )

100 %

999 Fine

24 Karats

91.7 %

917 Fine

22 Karats

75.0 %

750 Fine

18 Karats

58.5 %

583 Fine

14 Karats

41.6 %

416 Fine

10 Karats

 

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