A GROUP OF GEM-SET RINGS, a circular-cut synthetic sapphire in a tapered mount, ring size approx M, Egyptian assay marks; a marquise-cut amethyst in an openwork border of brilliant-cut diamonds mounted in 9 carat, ring size approx J, maker's mark MJ, UK hallmark; centrally set with a cushion rose-cut amethyst to brilliant-cut diamonds shoulders, ring size approx N, stamped 9ct; total lot weight 10.90 grams (3)