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My gold wedding band has 14kt F4 engraved in it.
10 k
That is the name of the company who made the ring. It should also have other marks for gold, silver, or gold filled.
18 carat gold
There is a jewelry maker-Fairy Tale Jewelers-FTJ...10K means almost half the weight of the piece is gold.
What does CI mean on a ring
What does SC mean inside a.ring
What does 925 inside a silver ring mean
TJC 10 k ring
Sterling silver
It seems to be a name, perhaps a family name.