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This is an 18k yellow gold, tanzanite and diamond ring. Stamped 750 (18k) and SETO with what looks like a small new moon in the upper right from letters. I searched 'til I'm cross-eyed, but cannot find this mark anywhere. This is such a beautiful ring, I'm just sure someone must have run into this mark before. I don't post often because I usually find the answer I need here-but I'm stumped on this. I'd appreciate any help, Deb