The drilled double tips of blue chalcedony are about 25 - 35mm long; the size of the hole is about 1.8 - 2.2mm. Each chalcedony point is unique in the grain of the mineral.
The terms "Calchedon" and "Carchedon" are first used by Pliny the Elder in his Latin Naturalis Historia in the 1st century AD. Which stones have been described here, however, cannot be clearly identified on the basis of the descriptions. Over "intermediate stages" like Calcedon, Calzedon, Chalzedon or Kalcedon the name changed to the today common Chalcedon.
In stone healing, the blue chalcedony stands for openness and sociability; the joy of communication and interaction with fellow human beings is supported.