For your consideration is a Ready-to-Dop 47.7ct piece of Sky Blue Topaz preform in a hexagon shape.
 
NOTES:
This stone is well shaped with good symmetry. A skilled cutter should be able to produce an approx. 35ct finished gemstone. This stone is a classic Sky Blue Topaz color. Great clarity, this material will cut clean gems. 
 
*Please refer to the photos/video for color and clarity details.
 
Mineral: Sky Blue Topaz
Origin: Brazil
Weight: 47.7 ct
Dimensions: 22mm x 19mm x 15mm
Clarity: Clean
Treatment: Irradiated