14kwg tanzanite and diamond necklace by designer Michael Christoff with one pear shaped tanzanite, weighing 9.14ct, VS type1 clarity and Violet blue color, surrounded by 564 round prong set diamonds, weighing 5.80ctw, VS-SI clarity and E-H color, 3 1/2" in length with triple 18" designer chain. 20.3gm AIGL appraised.