Various sterling silver rings found from all over.  The large ring directly above the turquoise "foot" ring is called a "spoon" ring.  It is made from a Ben Franklin Half dollar.  You can actually see some of the wording inside the ring.  A craftsman? would take the half dollar in one hand and tap it on the edge with a spoon until the desired thickness was achieved.  Next, the inside would be drilled or cut out and polished.  I found this in a Tooele, Utah drive-in theater.