Tommaso Design 8x6mm Octagon Emerald Cut Genuine Aquamarine Pendant Necklace 14 kt White Gold Metal: 14 kt White Gold. Dimensions: Width: 6.00 mm Length: 12.00 mm This Classic creation is made by the renowned Tommaso Design Studio. Tommaso Design Studio, is a reputable American Family Business based in New York since 1986, uses the highest quality materials, and will proudly stand behind all of its products. AQUAMARINE: The Birthstone for March. The name comes from the Roman word `Aqua` for water and `Mare` for sea. Aquamarine is said to provide everlasting youth, courage, happiness and a soothing influence on relationships. 18 inch Chain in a matching metal will be included