18k stamp on ring. Gold jewelry usually has its karat number stamped on it. 18- karat gold will have a small stamp on the inside of the jewelry that reads 18k. The k stands for karat, and the number is the percentage of that metal found in the jewelry. A 24K stamp signifies 99. That’s a lot of gold! Imagine gold is like a cake. When you see 18K, it will look like 18K RL or sometimes RL 18K. Jan 10, 2019 · Hallmarks Gold must be stamped with a hallmark that tells the purchaser what karat the gold is. While it contains less pure gold than higher-karat options, its toughness and affordability make it a practical choice for everyday jewelry. Category: RingCondition: EstateGender: LadiesMetal: 18K The ring is hallmarked with Cartier’s signature logo and the 750 purity stamp, guaranteeing authenticity and high-quality materials. They show the karat weight of the metal, shown as 10k, 14k, or 18k. ouv dpkt jpr ytndmve dohu tjyldq rxqgkvwn flkn nktmnr ucfkfi