2.31 Ct. Tourmaline from Brazil

This exquisite transparent 2.31 carat trillion shape bluish green tourmaline is a refined example of how precise cutting and natural color converge to create a collector grade gem, from The Natural Gemstone Company. Measuring 8.55 by 10.66 by 5.13 mm, this gem has been fashioned with a designer cut that emphasizes symmetry and optical performance, producing a lively face up presence that belies its moderate carat weight. The intense color intensity is even and well saturated across the table, delivering a rich bluish green that reads vivid under natural and artificial light. Clarity has been assessed as very very slightly included at eye level, a grade that tells a knowledgeable buyer that light transmission is excellent and that the stone will display minimal internal features to the unaided eye, while still retaining the natural character and stability that connoisseurs prize. The polish is excellent, with facet junctions that have been refined to maximize luster and scintillation, and the gem has undergone a standard heat treatment to enhance its desirable hue, a disclosure that we provide openly to maintain full transparency with our customers.

From a gemological perspective this tourmaline presents attributes that educated buyers will value, both for aesthetic reasons and for long term durability. Tourmaline is a complex borosilicate mineral with variable chemistry that permits a wide range of color, and bluish green varieties typically owe their tone to iron and in some cases to trace amounts of copper, producing a cool and lively greenish blue that is rare in deeply saturated examples. Typical refractive index values for tourmaline fall in the range 1.624 to 1.644, with noticeable pleochroism in many stones, meaning the color can shift subtly when viewed from different angles, a feature that the designer cut of this trillion shape takes full advantage of. Hardness on the Mohs scale is approximately 7 to 7.5, a level suited to everyday wear when set properly, and the specific gravity near 3.06 contributes to the gem feeling substantial for its size. The clarity grade of very very slightly included reflects only minor inclusions that do not detract from the gem when mounted, and the excellent polish enhances the stone eye appeal, producing crisp facet reflections and depth. The heat treatment applied here is a stable enhancement commonly accepted in the trade, performed to refine the primary hue and remove unwanted undertones, without masking origin or artificially saturating color in a way that would misrepresent the natural material. Origin is Brazil, a storied source of world class tourmaline, and provenance from Brazilian pegmatite deposits contributes to desirability among collectors and designers alike.

To appreciate why this gem is valuable, consider both its geological pedigree and the human craft applied to it. Millions of years ago anatectic melts and hydrothermal fluids rich in boron, lithium, and other mobile elements migrated through the continental crust, concentrating in late stage pegmatitic pockets within the granitic host rocks that now form parts of Brazil. In those secluded cavities crystals had the time and chemical environment necessary to grow, layer by layer, as the cooling fluids slowly exsolved. Trace concentrations of iron and in some locales of copper were incorporated into the crystal lattice during formation, imprinting the blue green color that is so highly prized today. Over geological time those pegmatites were uplifted and exposed by erosion, making the crystals accessible to mining. Skilled lapidaries then selected a piece that demonstrated both strong saturation and favorable internal features, and programmed a designer trillion cut to maximize brilliance and color dynamics, carefully faceting every plane to preserve weight while optimizing light return. The modest heat treatment applied in a controlled environment was used to refine hue without compromising structural integrity. The result is a gemstone that represents a direct link between deep time geological processes and modern lapidary artistry, supplied with full disclosure and confidence by The Natural Gemstone Company. For jewelers and buyers seeking an eye catching center stone that combines rarity of intense bluish green color, reliable clarity, and precision cutting, this 2.31 carat trillion tourmaline is an exceptional selection, and when properly set with a secure bezel or prong mounting it will become a focal point that endures, with routine care involving avoidance of harsh chemicals and extreme heat to maintain its beauty for generations.