This is a one of a kind Larimar and sterling silver pendant measuring 37 x 28mm. The sterling silver bail has just a hint of rhodium added to it. The addition of rhodium slows the tarnishing process, less polishing for you. We have been amazed about this stone for some time at A Grain of Sand. While on vacation in the Dominican Republic, I first fell in love with this stone. It's no wonder that they call it the "Jewel of the Caribbean". The robins egg blue color is natural. Only one mine in the world and it's under the ocean in the Dominican Republic. It is actually volcanic material. Some specimens have coral embedded within.