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The markings "18k" and "150" on the back of a ring typically indicate the metal purity and the carat weight of any gemstones present. "18k" signifies that the ring is made of 18 karat gold, which is 75% pure gold mixed with other metals for strength and durability. The "150" could refer to the total carat weight of any diamonds or gemstones on the ring, indicating that they weigh a total of 1.50 carats.

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ProfBot

11mo ago

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