The numbers on rings are super tiny so what you are probably reading is either 42.5 or 92.5. If the ring is gold you are seeing 42.5 which means that the ring is 42.5% gold and the rest alloy. If the ring is silver you are reading 92.5 which means that the ring is 92.5% silver.
From what I understand some jewelers stamped in the ring size!
What no they mean
More than likely, the 12 stamped in your ring means that it is 12 karat gold.
it possible could mean size
Im not sure, but i have a ring stamped with an ARJ as well. It is a silver ring and i believe there is also a stamping of a face as well.
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From what I understand some jewelers stamped in the ring size!
The letters RSG stamped on a ring means that the ring was preassembled. Any gems in the ring that is stamped RSG have not been certified.
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Most likely the ring is stamped with 925 instead of 525. This means that the ring is 92.5 percent silver.
It is the initials of the ring makers name
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Hallmarking
Japan