These beautiful natural Larimar tumbled nuggets beads measure 12 x 16mm on average. Each bead is unique in color and shape and has been tumbled and polished to perfection. 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. Because it is volcanic material, it is very hard and therefore difficult to cut or drill into beads, thus the high price. We think it's worth it.