Crystal This listing is for ONE (1) Seven chakra worry stone slab (RK9B1) This is a great little stone to keep in your pocket, or to use in your jewelry creations. The worry stones may be composed of quartz, selenite, moonstone, turquoise, sodalite, lapis, citrine, tiger eye, calcite, carnelian, amber, hematite, and other rainbow gem stones. STOCK PHOTO. Each slab will vary slightly in size and characteristics. Measures approx.: 34-42mm x 26-30mm Worry stones, also know as palm stones or thumb stones are smooth polished gemstones. They have a thumb-sized indentation so you can carry it in your pocket and rub it for relaxation and stress relief. People use them by holding the stone between the index finger and thumb and rubbing one's thumb back and forth across the stone.