A COLLECTION OF FIVE SINGLE-STONE DIAMOND RINGS, To include an 18ct yellow gold round brilliant-cut diamond ring, UK hallmark, size L½; an 18ct yellow gold round brilliant-cut illusion-set diamond ring, maker's mark, UK hallmark, size O½; a round brilliant-cut diamond ring in a four-claw setting and white metal, undistincted stamp, size M; a white metal rose-cut diamond ring, to a raised decorated mount, metal unmarked and untested, size M½; a yellow metal emerald and princess-cut diamond ring, stamped 'PLAT & 18CT', size L; total gross weight approx. 12.7 grams (5)