14K White Gold Cushion Cut Aquamarine and Diamond Halo Necklace. This classic halo necklace features a stunning 1.22ct cushion cut aquamarine, accented by a pave set diamond halo. The diamonds total .17cttw and are G in color and SI2 in clarity. Comes with a 14K white gold 18 inch rope chain. Designed by Allison Kaufman.