March Birthstone Color Pendant Necklace with Swarovski Crystal Set in Platinum. (March Aquamarine P8050BL) Brilliant Aquamarine Birthstone Colored Pendant Designed by William Wang and Hand-Crafted in the USA. Radiant Round Cut Swarovski Elements Crystal Stone Shows stunning sparkle and depth. Beautiful Platinum finish is designed to look fantastic and last a lifetime. Includes 18.5 inch snake chain with 3 inch extender adjustable to 21.5 inches. Swarovski Element Stone Measures .42 inch in Diameter.