18-Inch Hamilton Gold Plated Necklace with 4mm Aqua Birthstone Beads and Saint Apollonia Charm.Blue represents Aquamarine, the Birthstone for March.Hamilton gold is a special alloy designed to have a rich and deep gold color.All Bliss products, including this medal and necklace, are hand-made in Rhode Island and come with a lifetime guarantee against tarnish and damage.