Sterling Silver Tufa cast "Humming Bird" Ring. This ring is made by Marian Denipah who is known for her signature humming bird designs, it was made using the Tufa cast technique. In the center of the ring is a profile of a humming bird with an 18k gold flower accent. Ring Size 8 3/4. Dimensions: 3/4 inch on width at the top tapered down 1/2 inch on bottom for a comfortable fit.