Moonstone Necklace

The Moonstone is a stone of inner growth and strength. It soothes emotional instability and stress, and stabilises the emotions, providing calmness. The moonstone symbolizes new beginnings.(Not all crystals look exactly the same, some may look different than others, but they still carry the same effect.)

Like most crystals, Moonstone can be cleaned in multiple ways. Placing it around other crystals, setting it in saltwater, and running it over water are some useful and convenient methods. 
You should clean your crystal if it were present during a negative event if it is new or you haven't used it yet if it feels weak or unbalanced and after rituals.