Gold
9ct gold contains 37.5% pure gold (375 parts per thousand parts).
14ct gold contains 58.5% pre gold (585 parts per thousand parts).
18ct gold contains 75% pure gold (750 parts per thousand...
The THGE means Thin Heavy Gold Electroplate. Thus the ring is plated with a layer of 18K gold. 18K is a common plating material since the deep yellow (more so than 14K) helps conceal the silver color...