Natural Blue Sapphire and Natural Diamond Necklace, available in three exquisite sizes: 5 x 3mm with 1/8 CTW, 6x4mm with 1/5 CTW, or 7x5mm with 1/5 CTW. Surrounded by brilliant Natural Diamonds, G-H color and SI clarity in a mesmerizing halo, the large sapphire takes center stage, harmonizing with the polished 18-inch chain.