14K White Gold Emerald Cut Blue Topaz and Diamond Halo Necklace. This classic halo necklace features a stunning 1.75ct emerald cut blue topaz, accented by a pave set diamond halo. The diamonds total .11cttw and are H in color and SI3 in clarity. Comes with a 14K white gold 18 inch rope chain. Designed by Allison Kaufman.