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Millesimal fineness is a system of denoting the purity of platinum, gold and silver alloys by parts per thousand of pure metal in the alloy.
For example, an alloy containing 75% gold is denoted as "750".
It is an extension of the older carat (karat in North American spelling) system of denoting the purity of gold by fractions of 24, such as "18 carat" for an alloy with 75% (18 parts per 24) pure gold.
The millesimal fineness is usually rounded to a three figure number, particularly where used as a hallmark, and the fineness may vary slightly from the traditional versions of purity.
The most common millesimal finenesses used for precious metals:
Additional recommended knowledge
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Millesimal_fineness". A list of authors is available in Wikipedia.|