Bright and as beautiful as the full moon, natural rainbow moonstone comes in a variety of milky colors such as gray, white, silver, blue, and semitransparent. This alluring stone is a stone of lovers, often tied to the belief that if you give your lover a necklace of moonstone when the moon is full, you will forever have passion, love, and romance in your relationship. It is also referred to as the stone of eternal love.