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 flying humming bird with a 18K gold flower accent. Ring Size 6 1/2. Dimensions : 3/4 inch width on top tapered to 1/2 inch on bottom for comfortable fit.