Britannia Silver - has 95.8% silver purity.
(see full article on Sterling Silver) ...
Britannia Silver: A silver alloy composed of 958 parts silver in 1000 hallmarked with the figure of Britannia. Britannia silver was mandatory in England from 1697 to 1720 to prevent the melting down of sterling coins to create silver objects.
Britannia Silver
Silver containing 4.16% of copper compared with 7.5% in Sterling Silver.
British Plate ...
Britannia Silver has a pure silver content of 95.85% and no more than 4.16% copper. This silver is marked in the U.K. and Ireland as "958 silver." It is an even more pure form of silver than sterling silver. Hence it's higher valuer.
Britannia Silver
A silver alloy with a minimum fine silver content of 95.8%, that is resistant to firestain and is more easily worked, and work hardens less quickly than, sterling silver
Brooch ...
There are two types of silver alloys � Britannia Silver, which is at least 95% pure silver, and Sterling Silver, which is at least 92.5% pure silver. Sterling silver is typically used in jewellery. The remaining 7.
"Britannia Silver" is 95.84% Ag
"Mexican Silver" is 95% Ag + 5% Cu
"Sterling Silver" is at least 92.5% Ag; harder than pure Ag.
U.S "Coin Silver" is 90% Ag
Vermeil (Vur-MAY) is sterling silver with gold plating.
Many alloys are found in jewelry including Alpaca, Brass, Britannia Or pewter, Britannia silver, Bronze, Coin silver, Colored gold, Electrum, Gold(under 24Kt), Green gold, Nickel silver, Niello, Pewter, Pinchbeck, Pot metal, Rose gold, ...
958: 95.8% pure silver, also known as Britannia silver
925: 92.5% pure silver, also known as sterling silver
Silver pricing ...
 See also: Alloy, Britannia, Jewel, Silver, Metal
  
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