The 925 stamp on silver jewellery is all about the purity of the silver. It means that for every 1000 parts of material in the jewellery piece, 925 parts must be made of silver and no more than 75 parts should be a different metal. It breaks down into 92.5% silver and 7.5% an additional metal.
Antique silver & antique jewellery specialists AC Silver, state on their page dedicated to silver purity that the system denoting the purity or grade of silver is called millesimal fineness, a system that also includes gold and platinum. They explain that millesimal fineness indicates the purity of silver by parts per thousand of pure metal by mass in the alloy.
For sterling silver, the minimal millesimal fineness is 925. It is what is known as the ‘sterling standard’. A 925 sterling silver hallmark is stamped on the bottom of each genuine piece. The stamp and its shape are different depending on the country the silver has been made in. Note that if there is no stamp or a mark that cannot be traced or identified it means the purity of the silver is in question and it may even be fake sterling silver.
The same applies for gold jewellery. It needs to have karat markings in order to display its purity. However, jewellery is commonly stamped with whatever the majority metal is. So for gold vermeil or gold plated sterling silver jewellery, it would be stamped with the sterling silver purity hallmark.
Sterling 925 silver is the metal of choice for the Aquila silver jewellery collections. All our silver 925 jewellery carries the sterling standard as a form of quality assurance for our customers. Why not check your next Aquila piece for its 925 silver stamp?