Tanzanite and diamond necklace

composed of eight strands of facetted tanzanite beads accented to the front with a diamond surmount, millegrain-set with a round brilliant-cut diamond weighing approximately 0.75 carat and flanked by a round brilliant-cut and an Old-cut diamond weighing approximately 0.80 carat enclosed by forty pavé-set round brilliant-cut diamonds weighing approximately 0.61 carat, to a 18ct white gold lobster clasp and link chain, length approximately 500mm