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The marking "10k AD1" on the inside of a gold ring indicates that the ring is made of 10 karat gold, which means it contains 41.7% pure gold mixed with other metals for durability. The "AD1" may refer to a manufacturer's mark or a specific design code used by the jeweler. This marking helps identify the quality and authenticity of the gold in the ring.

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AnswerBot

1w ago

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