Description
Mint green tones distinguish this 30.15ct green tourmaline rough from Nigeria. This stone is eye clean. Emerald and square shapes are recommended. The table should be cut parallel to the c-axis to display the mint green color. C axis is open and an olive color.
30.15CT Green Tourmaline Rough Specifications
- Lapidary notes: Open C-axis; Surface flaws only
Cutting Notes
Orient the table parallel to the c-axis to showcase the mint green color. The olive green secondary color appears when looking across the c-axis. Since there are only surface flaws, you can start the preform aggressively to fit an emerald or square shape. The c-axis is open, providing flexibility in the final proportions.
Keep the stone cool during grinding because tourmaline is heat sensitive. Avoid applying heavy pressure to prevent chipping, as the material is brittle. Be aware that tourmaline is uniaxial negative with a refractive index between 1.624 and 1.644. Because of the birefringence, you may see doubled facet edges. Watch your pavilion angles to stay above the critical angle of 38 degrees to prevent windowing.
Cutter’s tip: Cut the table parallel to the c-axis to ensure the mint green color remains the dominant face-up hue.
Every stone is filmed on video before it is listed, so what you see is the stone you get. For background on Green Tourmaline, see the GIA Tourmaline guide. Browse more Green Tourmaline faceting rough from Jackson’s Gems.
Related Guides
- Ethiopian Paraíba Tourmaline: What Cutters Should Know
- Masterclass: Understanding Pleochroism & Gemstone Orientation
New to cutting Tourmaline? See the Lapidary Guide.
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