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.
The "E-T 10K" stamp inside a gold ring typically indicates the manufacturer's mark (E-T) and signifies that the ring is made of 10 karat gold. This means the gold content is 10 parts gold out of 24, or approximately 41.7% pure gold. The stamp helps identify the quality and authenticity of the metal used in the jewelry.
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.
gold
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