What is the gcj marking on your ring?

George Carter Jessop Jeweller based in San Diego, CA.

"Jessop's has been the trusted source of diamonds and fine jewelry in San Diego since 1892 when Joseph Jessop, great-grandfather of today's owner, Jim Jessop, opened J. Jessop and Sons. Generations of our family have been an integral part of the San Diego community. And five generations of Jessops have followed in each other's footsteps, carrying on a jewelry tradition that is unique in San Diego."

"George Carter Jessop, a long time owner of Jessop's, used his full name as the firm name for many years. Now our San Diego jewelry store simply goes by Jessop's."