For your consideration is a Ready-to-Dop 4.2ct Tourmaline rectangle preform.
 
NOTES:
This stone is well shaped with good symmetry, a skilled cutter should be able to yield an approx. 2.5-3ct finished gem. Clarity is clean. 
 
*Please refer to the photos/video for color and clarity details.
 
Mineral: Tourmaline (Green)
Origin: Believed to be Afghanistan (unconfirmed)
Weight: 4.2 ct
Dimensions: 8.5mm x 7mm x 7mm 
Clarity: Clean