Precision cut 3,51 ct green Congo Tourmaline in octagon shape  (3.51ct.)

Precision cut green Congo Tourmaline in octagon shape. Beautiful gentle apple-green color with slightly polychroism to bluewish-green. Exellent luster. Ideal cutting. Cutting diagram name - Emerald Barion Variation. Author of diagram - George Beard. Clarity - VVS (loupe clean). Very beautiful sparkling stone with fresh gentle color.

Note: The real color of the stone softer than in picture. To understand real color, watch the video below.
 
Mineral Type  - Natural Tourmaline
Weight           - 3,51 ct.
Shape            - Octagon (radiant)
Color              - Very very slightly Yellowish-Green     
Dimensions   - 8,34 x 8,30 x 7,39 mm
Clarity            - VVS (loupe clean)
Origin             - D.R. Congo
Treatment      - Untreated
Hardness       - 7 on Moh's scale
Questions are welcome!