<https://morrigans.co.uk/product/serephinite-crystal-thumbstone/#product>
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"Beautifully carved and polished crystals that fit perfectly with your thumb.Thumb Stones, also known as worry stones, feel comforting when held. These crystals emit a soft gentle energy which, depending on the properties of the crystal, can make you feel more relaxed just by rubbing your thumb over their smooth surface.All our Thumb Stones are approximately 4cm long.Please note that each of our crystals is unique, with its own beautiful characteristics, and may differ slightly from the illustration."
<https://morrigans.co.uk/product/serephinite-crystal-thumbstone/>