Gold Karat Information
Since ancient times, the purity of gold has been defined by the term karat, which is 1/24 part of pure gold by weight. Pure gold is equivalent to 24K. Gold purity may also be described by its fineness, which is the amount of pure gold in parts per 1000. For example, a gold ring containing 583 fine gold has 583 parts
(58.3%) gold and 417 parts
(41.7%) of other base metals.
Federal Trade Commission rules
require that all jewelry items
sold in the United States as gold
shall be described by "a correct
designation of the karat fineness
of the alloy."
Weighing Precious Metals
The weight of a piece of jewelry is a factor that
helps to determine its value. It is important
because it is an indication of the purity in an
item of jewelry. While Grams (g) and
pennyweights (dwt) are the units of weight
most commonly used in weighing precious
metals, We Buy Gold uses the pennyweight
standard (dwt). Precious metals are almost always weighted in the troy system of weights, where one pound troy equals twelve troy ounces and twenty pennyweights equals one troy ounce. The Avoirdupois weight system, where one pound equals 16 ounces, is used in the United States for most everything except precious metals. The following table summarizes useful weight conversions.