For your consideration is a 25.7ct piece of Natural Blue Topaz facet rough.
 
NOTES:
Clean well shaped piece of alluvial rough. 
 
*Please refer to the photos/video for color and clarity details.
 
Mineral: Topaz
Origin: Believed to be Brazil (unconfirmed)
Weight: 25.7 ct
Dimensions: 18mm x 15.5mm x 9.5mm
Clarity: Clean
Treatment: None