Moonstone is a powerful gemstone from the feldspar mineral family. Labradorite is also a member of this family. This June birthstone is best known for its unique property that is adularescence which gives the stone a soft shiny appearance. 

This moon-like sheen on the surface of the stone is perfect for awesome jewelry pieces. Referred as the gemstone of luck and new beginnings, moonstone is believed to promote inner peace, love, and spiritual growth. 

Rainbow moonstone prices per carat typically range from around $1 to $50, though prices can go higher for larger, high-quality stones with a strong, vivid color flash. The range depends on factors like size, quality, and the intensity of the iridescent play of color.