Rare Tiffany & Co. necklace, New York City, circa 1984–1990, masterfully handmade in mixed 18K yellow gold and platinum with a high-polish finish. Centered with a four-corner prong-set rectangular step-cut Brazilian vivid blue aquamarine (15 x 20 x 6mm; approx. 24.21 ct by formula), framed by 118 pavé-set round brilliant diamonds totaling approx. 2.36 ctw (E/F color, VS clarity). Constructed as two link-chain sections and finished with a concealed push-box clasp and figure?8 safety. Weight 81.95 grams; length 17.5 in; centerpiece measures 26 x 31 x 9mm. Signed “©TIFFANY & CO. HANDMADE 18KT PLATINUM”. Very good conditions. All our diamonds and colored gemstones are naturally earth-mined. Any synthetic (lab-grown) stones will be clearly indicated in the description. Upon Request, Auction House may provide an appraisal. This will carry an additional cost. Appraisals are made by our in house GIA certified Gemologist.