8.40 Ct. Tourmaline from Africa

This specimen from The Natural Gemstone Company is a transparent bluish green tourmaline weighing 8.40 carats, presented in an emerald cut shape with a fancy cut faceting arrangement. The carat weight is the defining attribute of this stone, placing it well above average sizes commonly found in the market and providing immediate visual presence when set. The 8.40 carat weight corresponds to substantial material mass, which not only contributes to the gemological value but also allows for deeper, more complex hand cutting and faceting, producing a face up size and pavilion depth that read as premium to both the eye and to a discerning trade appraisal. The gem displays a medium color intensity that balances saturation and brightness, yielding a bluish green hue that is neither too dark to obscure detail nor too light to appear washed out, and the overall presentation is one of considered proportion and weight consistent with a high quality collectible tourmaline.

The dimensions of the stone measure 15.10 by 9.51 by 7.66 millimeters, and these proportions are demonstrative of careful planning during cutting to maximize both weight retention and optical performance. The length and width create an elongated rectangle that is elegant for a variety of settings, and the 7.66 millimeter depth supports a substantial pavilion that contributes to strong light return and internal scintillation. The fancy cut facet architecture combined with an emerald cut outline produces a refined interplay of linear flashes and broader windows of color, enhancing the gem under both diffused and direct lighting. The excellent polish noted on this tourmaline is evident in the crisp facet junctions and smooth facet planes, which together enhance luster and surface reflectivity, and the cutting precision ensures that the gem exhibits consistent light behavior across the table and crown areas.

Clarity for this tourmaline is graded as very slightly included evaluated at eye level, and this grade conveys that any natural inclusions are minimal in both size and visibility to the unaided eye. These minor inclusions do not materially impact the stone's transparency or its appeal, and they are consistent with natural origin characteristics that are often appreciated by collectors and makers of fine jewelry for the confirmation of natural formation. The gem has been heat treated as an enhancement, a stable and accepted treatment in tourmaline that is used to refine and stabilize color, and this treatment is disclosed as part of the gem description. The declared African origin situates the specimen within a well regarded geographic source known for producing tourmalines with attractive saturation and clean material, and provenance combined with the weight, cut, clarity, and polish collectively support this stone being positioned as a premium offering within the category of colored gemstones.

From a practical perspective the 8.40 carat bluish green tourmaline is highly suitable for use in bespoke jewelry commissions, statement rings, and high end pendants where a single focal stone is desired. The substantial carat weight allows designers to employ classic prong and bezel settings with confidence that the gem will provide a commanding presence, while also permitting contemporary treatments such as halo settings that maintain the integrity of the gem's face up color and light performance. Care for the stone should follow standard best practices for tourmaline, avoiding exposure to harsh chemicals and extreme temperature shock, and professional cleaning and inspection will preserve the excellent polish and overall condition. The Natural Gemstone Company provides this description to assist gemological consideration and design planning, and we welcome requests for additional documentation regarding the stone's dimensions, treatment disclosure, and photographic views to aid final selection for commission or collection.