Rainbow fluorine

Worry stones are smooth, polished gemstones, usually in the shape of an oval with a thumb-sized indentation, used for relaxation or anxiety relief. ... They are used by holding the stone between the index finger and thumb and gently moving one's thumb back and forth across the stone.

It absorbs and neutralises negative energy and stress. An excellent learning aid, Fluorite increases our powers of concentration, self-confidence and helps us in decision-making. It encourages positivity, balances the energies, and improves balance and coordination, both physically and mentally.