The marking "925 DIA" on a ring indicates that the metal is made of sterling silver, which is composed of 92.5% pure silver and 7.5% other metals, typically copper. The "DIA" likely signifies that the piece features diamonds or diamond-like stones. This marking assures buyers of the quality of the silver used and suggests the presence of genuine diamonds.
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what does 925 A mean
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The 925 means that the ring is sterling silver (92.5% silver with 7.5% copper). Not sure about the DQZ2 though. It might be a manufacturer's mark, but I'm not certain.
925