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There are a number of "hallmarks" used to identify silver and gold. This give the grade of the metal and normally age.

There are a great number of sites that carry the relevant hallmarks. Be-aware that many "silver" rings are in fact a metal dipped in molten silver or gold and are not actually solid silver or gold - these are often marked as well but to identify precious metal coating.

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Q: What does 188 TH mean on silver jewelry?
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