14k Yellow Gold Necklace with Natural Pink Tourmaline and White Diamonds Every one-of-a-kind piece begins with a gemstone worth designing around. For this necklace, it was an extraordinary elongated hexagon pink tourmaline. Framed within our signature Aria frame and encircled by our Starry diamond setting, the stone remains the undeniable focal point. This is the only Elongated Hexagon Aria Necklace we'll ever make.