Millesimal fineness is a technique of denoting the purity of platinum, gold and silver alloys by components per thousand of pure metal by mass in the alloy. For example, an alloy containing 75% gold is denoted as “750”. Many European nations use the percentage hallmark stamps (i.e. ‘585’, ‘750’, and so forth) rather than ’14K’, ’18K’, and so on., which is utilized in the United States.
It is an extension of the older carat (karat in North American spelling) technique 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 by mass.
The millesimal fineness is usually rounded to a three figure quantity, especially where utilized as a hallmark, and the fineness could vary slightly from the standard versions of purity.
The most typical millesimal finenesses used for valuable metals:
999 (also known as 3 nines fine)
995 (what most dealer would acquire your platinum at if it is 100% pure)
950 (the most widespread purity for platinum jewellery)
900 (also identified as one nine fine)
999.99 (The purest variety of Gold in the marketplace)
999 (Fine gold equivalent to 24 carat, also recognized as 3 nines fine)
990 also known as two nines fine
916 (equivalent to 22 carat)
833 (equivalent to 20 carat)
750 (equivalent to 18 carat)
625 (equivalent to 15 carat)
585 (equivalent to 14 carat)
417 (equivalent to ten carat)
375 (equivalent to 9 carat)
333 (equivalent to 8 carat minimum regular for gold in Germany after 1884)
999.9 (Ultra-fine silver used by Royal Canadian Mint in the Canadian Silver Maple Leaf)
999 (Fine silver used in bullion bars, also identified as three nines fine)
980 (frequent common used in Mexico ca.1930 – 1945)
958 (equivalent to Britannia silver)
950 (equivalent to “French 1st Regular”)
925 (equivalent to Sterling silver)
900 (equivalent to “Coin silver” in the USA, also recognized as one particular nine fine)
875 (could be discovered in former USSR and in Switzerland)
833 (typical regular used in continental silver specifically among the Dutch, Swedish, and Germans)
830 (widespread normal utilised in older Scandinavian silver)
835 (a regular predominantly employed in Germany soon after 1884)
800 (minimum standard for silver in Germany after 1884 Egyptian silver Canadian silver circulating coinage)
750 (uncommon silver common discovered in older German, Swiss and Austro-Hungarian silver)
Gold as an investment
Silver as an investment
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Gold Palladium Platinum Rhodium Silver
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Carat (unit) Carat (purity) Discovering Millesimal fineness
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