sizes may vary because its natural gemstones made by nature sizes are around 0.025-0.50 inches (4-15 mm) Moonstone is composed of Orthoclase and Albite, two species from the Feldspar group. Rainbow Moonstone is a name often given to Labradorite in a white matrix. Moonstone is a 3rd Anniversary gemstone. Moonstone aids the digestive system, assimilates nutrients, eliminates toxins and fluid retention, and alleviates degenerative conditions of skin, hair, eyes, and fleshy organs such as the liver and pancreas. It stimulates the pineal gland and balances hormonal cycles, being excellent for PMS, conception, pregnancy, childbirth, and breastfeeding. Moonstone is also beneficial to men in opening the emotional self. A stone for “new beginnings”, Moonstone is a stone of inner growth and strength. It soothes emotional instability and stress, and stabilizes the emotions, providing calmness.