It's almost certainly the item's "fineness". For most jewelry the gold's purity is measured in units of 1000, often but not always represented as a decimal, with 1.000 being pure gold. Thus 800 (or 0.800 or .800) would mean gold that's 80% pure, with the remaining 20% being other metals added to increase the alloy's hardness.
Not
the stamp shows that the ring is of 14 karat gold piece; to check if it is real or not.
What does it mean
GOLD SHELL = Equals fake or gold plate If the GS stamp is inside of a diamond shape it's the makers mark for Gottlieb & Sons.
14 carat gold
62.5 % gold
Gold electroplate. Not gold.
gold
The stamp "RSC" inside a gold ring typically refers to the manufacturer or jeweler who made the ring, rather than indicating the metal composition. You would need to look for a separate stamp indicating the gold purity, such as "10K" for 10 carat gold. If the ring is a Roman silver coinage, it would likely have a different stamp or markings to denote its origin or historical significance.
The "14km" stamp inside a ring indicates that the ring is made of gold that contains 14 parts gold out of a total of 24 parts, meaning it is 58.3% pure gold. This is a common standard for gold jewelry, often referred to as 14-karat gold. The "km" may be a typographical error and should likely be "k," representing karats. This stamp signifies the quality and value of the gold used in the ring.
The Stamp YAG Means Gold Coated Silver
14KN stamped on the inside of a diamond ring typically means that the ring is made of 14 karat gold with the "N" indicating that it is a natural gold alloy. This stamp signifies the purity of the gold used in the ring.