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What do the Marks on Silver Jewelries Represent?

发布日期:2013-10-21

      S990 Sterling Silver jewelries: its silver content is less than 990‰. Marking: S990 or 990.
     S925 Silver is pure silver content at 925‰ and added with 75‰ copper. Marking: S925 or 925.                   
     It iscommonly recognized as the Sterling Silver. Now 925 Sterling Silver is usually plated with platinum to prevent silver becoming yellow or black out of sulfuration.
      White alloy: it is made of other metal but surficially plated with silver to deceive customers. When being appraised by authority, only the surface is appraised. As a result, it is appraised as 999 Sterling Silver or 925 Sterling Silver judging from the plating only.