Modified coins have no collector value, any value would be associated with the ring.
Without seeing the mark inside you would need to take it to a jeweler to find out if it is 18 Karat gold and the RGP is the makers mark or if it is Rolled Gold. A qualified jeweler can identify the item for you and will advise you on what it is and its value.
"18 ct" means the ring is made of 18 carat white gold, indicating the purity of the gold. "RGP" stands for "Rolled Gold Plate," which means the ring is likely coated with a thin layer of gold. This indicates that the ring is not solid gold but rather a base metal plated with a layer of gold.
RGP stands for rolled gold plated. An 18 RGP mark on jewelry means the jewelry is not a real 18k gold but only gold plated.
rolled gold plated
£456 p
1 dollar
It will depend on the weight.
4 million dollars
Jewelry engraved with RGP, which stands for Rolled Gold Plating, or plaqué d'or laminé, (proper designation: 1/30 14 kt.), contains approximately 100 times the average amount of gold utilized in gold plating (which is either sprayed or dipped). Rolled Gold Plating involves the lamination of a thin sheet of gold leaf with a lesser metal (usually brass), fused by heating under pressure.
The value of an 18-karat gold ring with 31 diamond stones depends on several factors, including the quality and size of the diamonds, the design of the ring, and current market conditions. Generally, the gold content in an 18-karat ring contributes to its base value, while the diamonds can significantly increase its worth. On average, such a ring could range from a few hundred to several thousand dollars, but an appraisal from a certified jeweler would provide a more accurate estimate.
What does 18kHGA mean stamped in a ring
Google search for "18 gauge tongue ring"!