This size 12 men's cigar band style ring is made of sterling and fine silver with hand-stamped details. The Biggs Jasper stone was cut by Alisa of Ground and Lift Jewelry, especially for this ring. Biggs Jasper is a picture jasper with shell- or layer-like patterns in shades of brown. It was first discovered in 1960 near Biggs Junction, Oregon and is found in basalt deposits. It was formed as mud from volcanic ash deposited on basalt terrain, & compressed through volcanic activity.