Abstract: An adjustable ring is constructed from a first material to form at least a portion of a substantially circular shape. The first material includes two first C-shaped distal halves, and two second C-shaped proximate halves, and each of the halves arranged together to form a vertically bisected O-shape with a top portion removed defining a first arcuate void portion and a bottom portion removed defining a second arcuate void portion. The ring also includes a second material created to fit inside each of the two first and two second C-shaped halves of the first material to form a substantially circular shape defining an inner diameter for a given ring size. The second material includes at least one stress relief point and at least one size bar formed therewith. The second material is created to fit inside the first material using one or more of casting, co-casting, machining, forging, and stamping.