925 means its sterling silver- that it's 92.5% silver and the other 7.5% other metals- I think usually copper but not sure, and I think some manufacturers use different metals. It's mixed because pure silver is too soft for jewellery. It's strange though that this piece has tarnished and the others haven't as they are most likely 925 as well? All I can think of is that Tiffany's use a different metal or something?
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