Marco Bicego 18K Yellow Gold Masai Collar Necklace Featuring a 1.53ct Cushion Cut Pink Tourmaline Stone Set East to West & 1.20cts of White Diamonds, 16.5" in length. The linear elegance of our coil enhanced by the light of diamonds and pink tourmaline: this flat coil tennis necklace features an elegant, brilliant-cut diamond pavé and is further embellished with a carefully selected cushion-cut pink tourmaline. Crafted in 18K yellow gold, it bears the hallmark of a true timeless classic.