Each of these sterling silver ring features a different piece of American Turquoise, known for its color ranges of blues, greens, browns and blacks. The cattle skull image is an original drawing, sawn out of sheet metal by hand, with all the the designs elements then soldered together in layers. Material: Sterling silver, American Turquoise. Size: Each ring measures approximately 1.5" in length, and 1 3/8" across at its widest point.