TANZANITE MINES SHUT DOWN NEW. Genuine Tanzanite trillion cut .40 ctw stone on 18" stainless omega chain This fashionable necklace features a crossover slide, accented by a gleaming trillion-cut tanzanite (.40 ctw), gracefully suspended from an 18-inch omega chain. Each Tanzanite stone is unique. Product color may vary due to naturally occuring color variations of Tanzanite. https://www.diamondsinternational.com/store/collections/safi-kilima/safi-kilima-tanzanite-slide-on-omega-chain-necklace