Opal and tourmaline flower necklace

a string of opal beads weighing approximately 87.40 ct, with three hand-carved tourmaline flower charms weighing approximately 8.29 ct, the hand-caved tourmaline inlaid with a round brilliant-cut diamond weighing approximately 0.02 ct, alternating between three charms channel-set with oval-cut tourmalines weighing approximatley 1.46 ct and three baguette-cut pink tourmalines weighing approximately 0.86 ct, a signoretti clasp, 18k yellow gold clasp and 9k yellow gold charms, length approximately cm, total weight 7.70 grams