18K GE on a ring means the ring is made of 18 karat gold. The percentage of gold in the ring is 75%. GE stands for gold electroplate which is a thin layer of gold on the surface of the metal of the ring.
The carat or karat (symbol: K or kt) is a unit of purity for goldalloys.
Carat purity is measured as 24 times the pure mass divided by the total mass:
: is the carat rating of the material,