Unless it is somebody's initials, it probably stands for the metal, palladium (atomic symbol Pd) used in the making of white gold alloy, and also cast on its own to make various types of jewellry.
PD 925
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Palladium
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From what I understand some jewelers stamped in the ring size!
jss on ring
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.
Most likely the ring is stamped with 925 instead of 525. This means that the ring is 92.5 percent silver.
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