The system for grading silver purity is Emailed millesimal fineness and is expressed as a decimal. Fine silver is defined by its purity. Any silver used for investment or trade on metal and commodities exchanges must be 99.9 percent pure, or .999, sometimes referred to as “three nines fine.” Investment grade fine silver is stamped with a hallmark certifying its purity.
Sterling silver used in jewellery, for example, has a purity of 92.5 percent. Thus, silver jewellery is often stamped with 925.
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Sterling silver has a millesimal fineness of 925. The sterling silver alloy is 92.5% pure silver and 7.5 per cent copper or other metals.