"the good luck stone” Moonstone is a very personal stone. It is a reflection of the person who owns it. It does not add or detract, only shows how it is. This is why the moonstone is said to perceive that which "is". Moonstone is an excellent stone to use in meditation to understand oneself. Placing it in the moonlight of a moon reaching its fullness, not a full or waning moon, can revitalize it. Associated with the moon, this was the stone of the goddess Diana. The most powerful time to use moonstone is in a full moon. It has been worn as an amulet to bring good emotions to the wearer, while protecting those of a sensitive nature.