8 K .33820
9 K .37440
10 K .41600
12 K .50000
14 K .58240
16 K .66560
18 K .74880
20 K .83200
21 K .87360
22 K .91520
24 K .99999
Colors of Gold:
Yellow green, red, and white are produced by variations in the alloy. silver and zinc tend to give a green color, copper-red and nickel white.
Gold Filled is made by joining a layer (or layers) of gold alloy to a base metal alloy and then rolling or drawing to the thickness required.
Rolled Gold Plate is the same as gold filled, but of lower quality.
Gold Electroplate is usually made by electrolytically depositing fine gold on base metal.
Gold Solders are usually 2 to 4 karats less than the gold on which they are used.
Sterling Silver is 925/1000 (92 1/2%) fine silver and 75/1000 (7 1/2%) copper.
Coin Silver is 900/1000 (90%) fine silver and the balance copper. The same alloy is used for U.S, silver coins.
Commercial Silver is a term applied to silver that is 999 fine or higher
Foreigbn Sliverware contains varying percentages of silver. In some cases the fineness is as low as 700/1000.
Silver Plated Ware is made by electroplating fine silver on a base metal alloy - usually nickel or Britannia metal, sometimes brass or copper.