RAINBOW MOONSTONE RING. This ring features a piece of high quality Sri Lankan Moonstone, excellent “blue flash”. The split shank design, the cut of the gemstone ,plus the silver bezel setting , make for unique, and beautiful piece of jewellery. Rainbow Moonstone is a wonderful healing gemstone. The best known rainbow moonstone metaphysical properties are the stone’s ability to offer mental clarity and shield its owner from negative energy’s. This ring is size 62 (or T ), the ring weights 7.95g and the gemstone measures 22mm x 9mm.