It's probably someones initials.
A gold ring that is stamped with 10 K F means that the ring is 10 karats. The F means that the ring is considered fine jewelry.
Titanium
Marks stamped on a ring may tell you the manufacturer as well as the composition and metal quality.
It is the silver content in the ring. 988 is 98.8% silver.
Plated with 10kt gold
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From what I understand some jewelers stamped in the ring size!
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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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