A GROUP OF THREE DIAMOND RINGS, An 18ct yellow gold and platinum flower-designed ring, set with a central round-cut sapphire, surrounded by single old-cut diamonds in an illusion setting, maker's mark BKT, UK hallmark, size N½, 3.5g, an 18ct yellow gold ring set with three circular-cut blue stones and four natural-cut diamonds, maker's mark AJL, UK hallmark, size S½, 2.5g, and a three-stone ring set with brilliant-cut diamonds, stamped 18ct & PLAT, size N, 2.6g (3)