10kt gold diamond and blue Spinnel ring size 6 Stunning

This is a beautiful ring, again my photography skills do not do it justice. A 12.1 mm Blue Spinel, like a rectangle that was pinched in the middle. A diamond on either side. I've tried to find information on the hallmark KGC. It was registered in 1951 but I can't say for sure its that. It expired in 1980s. I had just washed it so I think I needed to dry a little and got spots. This is a great ring as gift to yourself! Or a promise, engagement or anniversary ring. I mean ...I could make reasons forever..💌💝💖