Gumuchian Cascade Riviera 18k White Gold Diamond Necklace

18 karat white gold 3 row diamond necklace with a taper; 253 round brilliant cut diamonds; 25.14 carats; with a .50 carat center diamond in the 3 row; 21 baguette cut diamonds; 1.98 carats. ; shared prong setting; 17" length.