Millesimal Fineness
 
Millesimal fineness is the system denoting the purity of silver, gold and platinum alloys by parts per thousand of pure metal by mass in the alloy. e.g. the sterling silver standard has a minimum millesimal fineness of 925.
 
Millesimal Fineness Associated With Silver
 
  • 999 - fine silver used in bullionbars
  • 980 - common standard used in Mexico 1930 - 1949
  • 958 - eqivalent to Britannia silver*
  • 950 - equivalent to French 1st Standard
  • 925 - equivalent to Sterling silver
  • 900 - eqivalent to USA 'Coin silver'
  • 875 - used in the former USSR
  • 830 - used in older Scandanavian silver
  • 800 - German standard silver after 1884; Egyptian silver
 
* Britannia standard silver was introduced by the British Government in 1697.  However, this has only been denoted by the silver hallmark 958 since the hallmarking changes introduced in 1999.
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