Sterling Silver men's ring by Studio GL. Ring is size 13, and has inlay of Wooly Mammoth Ivory, Wooly Mammoth tooth is extremely rare and is petrified Ivory. The mammoth is an extinct species that roamed North America and Siberia during the Pleistocene age. A rainbow of colors are found when the ivory is cut for inlay jewelry. You will excellent examples of Wooly Mammoth ivory by Studio GL. Hallmarked.