The Sun and Moon Ring ~ crushed gemstone brass adjustable ring
 
Shown here in malachite (green) + red leaf and chrysocolla + gold leaf.  Also can be made with coral + red leaf, turquoise + gold leaf peach selenite + gold flake or lapis + gold leaf or specularite.  Adjustable raw brass ring.  Average size 7, adjusts up and down approx one size to fit.