14k Yellow Gold Necklace with Natural Aquamarine and White Diamonds Every one-of-a-kind Aria Necklace starts with an extraordinary stone. For this design, it was a lozenge-cut aquamarine whose uncommon shape felt perfectly at home within our signature Aria frame. Encircled by our Starry diamond setting, every detail was designed to celebrate the gemstone at its center. This is the only Hexagon-Cut Aquamarine Aria Necklace we'll ever make.