The marking "10nv" on a ring typically indicates that the piece is made of 10-karat gold (10k), with "nv" possibly referring to a specific manufacturer's code or design, though it is less common. The "10" signifies that the metal is composed of 41.7% gold, with the remainder being other metals for strength and durability. It's important to verify with the jeweler or manufacturer for specific meanings, as markings can vary.
925 on a ring mean
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