The Blue Lagoon Necklace is 14k Gold Vermeil with an organic raw Aquamarine stone measuring from 10 - 13mm in diameter. The chain is adjustable from 16" to 20". Design collaboration between Camille Kostek & Dune Jewelry. Handmade with Love & Sandy Hands in the USA® Aquamarine is a stunning gemstone that exhibits variations of hue that make it just as unique and beautiful as your favorite ocean. Please keep in mind that each stone will range in color, making no two stones exactly the same.