This is a listing for a blue chalcedony skull. We have five listed, all with different personalities.
Chalcedony is a fairly rare gem, and the blue is the most expensive. It's a gentle, nurturing stone that people believe to absorb negative energy. It's also associated with the throat chakra, the moon, and water, so this would be a wonderful piece to use in your moon rituals.
This one weighs 136g, measurements shown in the picture.