The Thumb Stones owe their name to their use as a massage stone for the thumb. An ideal hand-flatterer, which can be easily carried along in the trouser pocket by its flat form. Carried in the pocket, it stimulates - even unconsciously - to take in the hand.
Other names for the light green Serpentine are precious Serpentine, New Jade, China Jade, Bowenite and Antigorite.