Pearl necklace with diamond flower clasp

A cultured Akoya pearl strand necklace, featuring round pearls graduating from 8.5mm to 9.0mm, of cream body colour with rosey lustre, individually knotted to a floral tongue-clasp, set with a central round brilliant-cut diamond of approximately 0.25ct, the surrounding petals each set with a diamond of 2.2mm, in unmarked white metal, testing as 18ct, length approximately 50cm