Two pairs of diamond-set hoop earrings

Two pairs of diamond-set hoop earrings, one pair by Mappin & Webb, each hinged earring collet-set to the front with brilliant-cut diamonds in platinum, maker's mark M&W, London hallmarks (date letter obscured), 1.3cm high, together with another pair of hoop earrings, each hinged earring set with three rows of round brilliant-cut diamonds to the front in 18ct white gold, London hallmarks, 1.5cm high