Worry stone
small stones rubbed for anxiety

Worry stones are smooth, polished gemstones, usually in the shape of an oval with a thumb-sized indentation, used for relaxation or anxiety relief. Worry stones are typically around 3 centimetres (1 in) in size. They are used by holding the stone between the index finger and thumb and gently moving the thumb back and forth across it. The action of moving one's thumb back and forth across the stone is thought to reduce stress, but there is no conclusive scientific evidence to support this.
Worry stones may also be called palm stones, thumb stones, fidget stones, soothing stones, or sensory stones.
History
As a folk practice implement, worry stones have many origins. Variations on the concept originate in ancient Greece, Tibet, Ireland, and multiple Native American tribes. The concept of a worry stone began by the simple action of picking a smooth stone and fiddling with the stone. Worry stones made by sea water were generally used by Ancient Greeks. The smoothness of the stone was most often created naturally by running water.
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