RAINBOW MOONSTONE RING. This ring features a teardrop shaped Rainbow Moonstone gemstone, handmade with a silver `finger ` style design. The gemstone displays a fine ‘blue-flash” with gold banding. Rainbow Moonstone is a heartwarming gemstone because of its bright and elevating vibe. Rainbow Moonstone is the gemstone for people born in June and is connected with the astrological sign of Cancer. This ring is size 57 (or P), it weights 7.4g and the gemstone measures 22mm x 12mm.