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For the necessary properties of silver jewelry,the jewelry is not made of pure noble metals.The pure silver is too soft to work with.To give it the necessary mechanical properties and a wishful color nonferrous metals are brought into.This is we commonly heared "Alloys",which made of silver with copper,sometimes with palladium ,nickel, zinc and cadmium.
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. For instance, gold is too soft to work with. To give them the necessary mechanical properties and a wishful color nonferrous metals. It is the precious metal content that determines the mark of quality.
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In many countries, precious metal must be stamped with a quality mark such as "925" for sterling. Some countries require jewelry made of precious metal be submitted to a governmental assay office for destructive testing before being marked and sold. In most European countries the metric system of the mark defining is used. It means that it is defined by the number of parts of the precious metal in 1000 weight units of the alloy.
The quality mark of precious metals alloys is set legislatively and is guaranteed by the state. All the jewelry necessarily undergoes, For many reasons, not all silver jewelry is marked. For one thing, registering a trademark costs over $1,000. Makers may choose to not spend so much money for a legal hallmark.
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