14 Karat White Gold 7x5 mm Peridot & 1/4 CTW Diamond Halo 18" Necklace. The Necklace Features a 0.90 Carat Oval Peridot Center Stone and is Accented with 0.25 Carats of Round Brilliant Diamonds. This Halo Peridot and Diamond Pendant comes with an 18 Inch 14KT White Gold Double Cable Chain.