More than likely it is the initial for the manufacturer of the ring.
The "925" stamp inside a ring indicates that the ring is made of sterling silver, which is 92.5% pure silver. The "D" stamp could be a maker's mark or a designer's mark indicating the manufacturer of the ring.
10K inside a ring indicates that the ring is made of 10 karat gold, which means that the ring is 41.7% gold alloyed with other metals. It is a common type of gold used in jewelry due to its durability and affordability.
TJC stamped on the inside of a 925 ring likely represents the manufacturer or brand name. 925 refers to the silver purity of the ring, which is 92.5% pure silver.
CN stamped on the inside of a ring likely stands for "China," indicating that the ring was manufactured in China. It is a common practice for jewelry makers to mark their products with the country of origin.
The stamp "18KBP" on the inside of a ring typically means that the ring is made of 18 karat gold plating. This indicates that the ring is coated with a layer of 18 karat gold over another base metal.
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