Each Tiffany style piece of jewelry that we sell however, is made of sterling silver and is stamped with a 925 fineness mark which indicates that the item is made of 92.5% pure sterling silver and 7.5% of another metal, usually copper, which gives the piece additional hardness and strength. In this regard, we continue the long tradition established by Louis Tiffany himself in the 1850's by insuring that each piece of jewelry ArgentoJeweler sells has the 925 stamp of quality.