These rings are hand made custom desisgns. They are both lost wax casting first carved in wax. Slight irregularites are an identifying feature of truely hand made jewelry. However they seldome dominate the design.
The ring design on the left has been made several times. I wear one myself, but this one is new. Same size as the one on the right.
The ring on the right is a custom one off design (so far) made for a person who has a passion for brewing craft beer. He especially loves wheat beer and those are ears of wheat encircling the band. It's a design he specifically requested.
KautzCraft Studio specializes in custom carved lost wax designed rings. Look through the gallery photos and see as few examples of past designs.