A superb Enhydro Quartz cabochon from Madagascar.
The transparent gem has a large negative void in the centre of the cabochon which displays a hexagonal outline, following the crystal growth habit of the host Quartz.
This internal cavity is filled with water which was present during the stones formation.
Trapped within the liquid is a gas bubble which has room to move freely through its enclosure and can be seen clearly by eye.
Image 4 is a magnified view of the bubble lodged in its 3-dimensional cavity.
To see a short YouTube video of the gem in action please use this link :
weight: 71.37 carats
shape: Oval cabochon
dimensions: 29.41 x 22.49 x 15.76 mm