18ct white gold, coloured diamond and diamond ring, centring an open work bombe cluster, claw-set with variously-cut diamonds of varied tints framed by a scalloped border of brilliant-cut near colourless diamonds, between open work diamond set shoulders, the diamonds all together stated to weigh 4.75 carats, size Q, maker's mark MRB. Please note that the diamonds of varied tint have not been tested for natural colour origin.