The "gdm 10k" marking on a ring indicates that the ring is made of 10 karat gold. Karat (k) is a measure of the purity of gold, with 24k being pure gold. Therefore, 10k gold means that the ring is made up of 41.7% gold, with the remaining 58.3% being other metals. The "gdm" likely represents the manufacturer or jeweler who made the ring.
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