AKA "Celestial Ye Ming Zhu"
These stones are said to have been exclusive to Chinese Emperors, their Wives, and other royalty. Said to bring happiness, creativity, and good fortune to those who keep it near.
Ye (Night) Ming (Bright) Zhu (Pearl) since this stone is photo-luminescent and is able to absorb energy (light, heat, life force), hold onto it and then change it into a form that is needed.
This stone is able to glow in the dark naturally. Just allow it to store some light and then turn off the lights to see why this stone has been so rare for so long.