Blue Moonstone; the above 6mm round cabochon, set in a handmade Silver ring, is a good example of why this gemstone has since ancient times been linked to the Moon: with its sheen, its interior bluish light, its luminescence, the ancient Europeans linked the gem Moonstone to their lunar deities.
Moonstone is not a tough gemstone; Quartz is considered tough; any gemstone more tough than Quartz is really tough, anything less tough than Quartz is considered a touch on the fragile side, and Moonstone is that. However, its relative fragility has not dented its popularity, indeed it is among the most popular of semi-precious gemstones.
The main problem with Moonstone for the wearer is the scuffing of the surface of the gemstone. The more the surface is scuffed, the less bright and luminous its sheen. It is a gemstone requiring care.