What 10k rmi mean on a ring?

A 10K marking on a ring means that it is 10-karat gold. 10K is the minimum gold quality, consisting of 10 parts gold to 14 parts of other metals. The next three letters, RMI, are the jeweler markings. RMI stands for Romel Manufacturing Inc., which is one of the largest manufacturers of precious metal jewelery as well as imitation jewelery. They are based in New Baltimore, Michigan.