A stunning art deco style ring crafted from sterling silver set with a central round turquoise cabochon stone surrounded by sparkling marcasite gemstonesonce thought to cure illness turquoise is now celebrated for its bold and bright blue hues and many collectors hail the dark veiny matrix that can interweave the stone as its most beautiful featureonce used as a substitute for the shine of a diamond the natural semi precious gemstone marcasite is now celebrated for its lustre and metallic b