Blue Bowlerite Octagon
 
This octagon shaped cabochon is done freehand, so it is not exact measurements on every side.
 
The measurements are 5/8 inch (15.875 mm) x 5/8 inch(15.875 mm)  1/2 inch (12.7 mm) x 5/8 inch (15.875 mm) x 1/2 inch ( 12.7 mm) x 5/8 inch (15.875 mm) x 1/2 inch (12.7 mm) x 1/2 inch (12.7 mm) with a nice dome, slanting down to a 1/8 inch (3.175 mm) girdle.
 
Bowlerite is crafted from recycled bowling balls.