This one of a kind ingot ring created by award winning Navajo artist, Calvin Martinez, features a gorgeous cluster of nine rare high grade natural&nbsp;Carico Lake spiderweb turquoise&nbsp;cabochons mined in the early 1970's. Known as Carico Lake supreme the turquoise has a beautiful deep sky blue hue with shades of both golden and reddish-brown webbing. The ring is made from labor intensive hand rolled and hammered ingot sterling silver with hand twisted wire around the center stone ...: 