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.
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Modified coins have no collector value, any value would be associated with the ring.
"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.
The 18K indicates 18 karat gold. The HGE indicates heavy gold electroplate, meaning the ring is not solid gold but gold plated. The A might indicate the manufacturer.
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.
Anything is 'worth' whatever some will pay you for it. You can take your jewelery to a jeweler to determine whether or not the gems are diamonds, and from there decide how to value your item.
What does 18kHGA mean stamped in a ring