| Weight | 15.80 ct |
|---|---|
| Dimensions | 16.8 × 13.6 × 8.4 mm |
| Grade | Facet Grade |
| Variety | Tourmaline |
| Treatment | natural and unheated |
| Mining Location | kolonna village around mining in Sri Lanka |
| Clarity | slightly included |
15.80 ct Ceylon Natural Unheated Mint Green Tourmaline Rough from Kolonna, Sri Lanka – Facet Grade
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Stone Identity & Quality
This is a 15.80 ct Ceylon Natural Unheated Mint Green Tourmaline rough measuring 16.8 × 13.6 × 8.4 mm. It is facet-grade natural rough sourced from Kolonna village around mining in Sri Lanka, within Sabaragamuwa Province.
The material is presented in its natural unheated condition and retains the irregular rounded character associated with alluvial rough. The stone is slightly included, an important consideration when evaluating its eventual cutting direction, clean areas, and potential yield.
Color & Visual Characteristics
The principal color is mint green, appearing from light mint-green to a slightly more yellowish-green tone depending on illumination, thickness, and viewing direction.
Strong transmitted light makes portions of the rough appear considerably brighter and more saturated, while natural surface viewing gives a softer and more subdued green appearance. This difference is important when assessing rough because the color seen through concentrated backlighting should not automatically be considered the expected face-up color after cutting.
The material also displays a vitreous appearance where the surface and lighting allow light to enter the body.
Internal & External Features
The rough retains a naturally worn alluvial exterior with irregular depressions, surface marks, and rounded areas. Internally, the stone is slightly included, with features becoming easier to observe when illuminated from behind or from the side.
The combination of its natural surface, internal features, color distribution, and relatively substantial depth needs to be evaluated together before deciding the final orientation.
Cutting, Specimen, or Treatment Potential
As facet-grade tourmaline rough, the primary potential of this stone is professional custom faceting. Its 15.80 ct starting weight and 8.4 mm depth provide material for the cutter to evaluate several possible orientations.
A successful plan should consider the direction producing the most attractive mint-green face-up appearance while also managing inclusions and avoiding unnecessary weight loss. Preforming may reveal additional information that cannot be confidently determined from the untouched rough.
No particular finished weight, shape, clarity, or color result should be guaranteed before the stone has been properly examined and preformed. Custom cutting and certification can be arranged if suitable.
Source & Ethical Position
Danushka Gems & Minings works closely with Sri Lankan gemstone-producing areas and evaluates natural rough material with attention to its actual characteristics rather than promising results before cutting.
This tourmaline is sourced from Kolonna village around mining in Sri Lanka, in Sabaragamuwa Province. Our approach is to document the stone in rough form, examine its color and internal structure under different lighting conditions, and provide buyers and cutters with practical information for making informed decisions.
Frequently Asked Questions
A: It is a natural Sri Lankan mint green tourmaline presented as facet-grade rough.
A: It weighs 15.80 ct and measures 16.8 × 13.6 × 8.4 mm.
A: It comes from Kolonna village around mining in Sri Lanka, within Sabaragamuwa Province.
A: No. It is presented as natural unheated tourmaline rough.
A: It has useful size and depth for professional cutting evaluation, but no finished weight should be promised before orientation, inclusion study, preforming, and yield planning.
