SALE: (MARKED DOWN FROM $48.88). This teardrop shaped rainbow blue moonstone is a beaut ! Up for sale is this beautiful unique vintage solitaire deep blue rainbow moonstone. The ring is in very good vintage condition. The sheen on this ring is amazing with such beautiful blue color. This ring is a size 8.25 and is made with 925 sterling silver overlay with a copper base. Main Stone: Rainbow Moonstone Main Stone Color: Blue Multi Color Rainbow Ring Size: 8.25 Metal: Sterling Silver Plated with copper base Stone Type; Natural Gemstone (not enhanced)