A collection of jewellery

A collection of jewellery, comprising: a pair of rose quartz and diamond studs, each set with a rose quartz cabochon within a surround of round brilliant-cut diamonds, in yellow gold, length 1.8cm; an emerald and diamond ring of bombé design, centred with a stylised floral motif of circular-cut emeralds within a surround of round brilliant-cut diamonds in yellow gold, stamped 750, size M; an emerald ring, set with an oval emerald cabochon in an openwork surround accented with diamonds, size N; and a three-stone ring, set with simulant diamonds, in yellow gold, stamped 14K, size L