6.48 Ct. Tourmaline from Brazil

This 6.48 carat round shape green tourmaline from The Natural Gemstone Company is a striking example of gemological quality and refined craftsmanship. Measuring 11.45 x 11.24 x 8.83 mm, the stone is fashioned in a mixed brilliant cut that combines a faceted crown optimized for scintillation with a stepped pavilion that enhances light return and depth of color. The gem presents an intense color intensity that is even across the table and crown, and the surface shows an excellent polish that maximizes the smoothness of facet junctions and the precision of facet angles. Clarity has been graded as eye clean at eye level, indicating that no inclusions are visible to the unaided eye under normal viewing, a characteristic that materially enhances both aesthetic appeal and market value. Origin information traces this tourmaline to Brazil, a long standing source of high quality tourmaline material, and the gem has undergone a disclosed heat treatment to stabilize and concentrate color, a widely accepted enhancement in the trade when transparently reported.

At a structural level tourmaline is an anisotropic trigonal crystal that exhibits strong dichroism and directional optical behavior, properties that are central to the gemstones visual performance. The mixed brilliant cutting style chosen for this piece takes advantage of tourmalines refractive behavior by aligning critical facets with the crystal axes to maximize internal reflection and return of light to the viewer. Light entering the crown is broken into numerous internal pathways by precisely cut pavilion facets, producing intense brilliance and lively scintillation, while the gems relatively high refractive index contributes to crisp facet contrast. The combination of the gemological properties of tourmaline and the cutters decisions about facet geometry creates a signature sparkle that differs from purely brilliant cut stones, because the mixed cut produces a balance of broad flash and lively pinpoint scintillation that is especially evident when the stone is moved under light.

Clarity and polish play a decisive role in perceived sparkle and value, and this tourmaline excels on both counts. Eye clean clarity means the stone presents a visually uninterrupted plane of color and light, allowing internal reflections to circulate without obstruction, and the excellent polish means that light is reflected from the surface with minimal diffusion. Under magnification naturally occurring features typical of Brazilian tourmaline such as thin growth tubes or minute two phase inclusions may be present, however they are not visible at normal viewing distances and they authenticate the natural origin. The disclosed heat treatment is a commonly applied enhancement for tourmaline that can deepen green tones and reduce brownish overtones, creating a purer hue while remaining stable under ordinary wear conditions. For the educated buyer these factors are important because they clarify how much of the stones beauty derives from natural crystal quality and how much from skillful cutting and responsible enhancement, a balance that The Natural Gemstone Company documents and certifies for each offering.

For collectors and connoisseurs the combination of a substantial 6.48 carat weight, a well executed mixed brilliant cut, intense color saturation, eye clean clarity, and excellent polish makes this Brazilian tourmaline a rare and versatile choice. The crystals trigonal symmetry and pleochroic tendencies mean that when set in jewelry the stone will display subtle shifts in tone and vivid flashes of green, attributes that are accentuated by a well chosen setting that allows light to penetrate and escape freely. Practical care advice is simple, use warm soapy water and a soft brush for routine cleaning, avoid sudden temperature shocks and harsh chemicals, and remove jewelry during heavy impact activities to preserve polish over time. The Natural Gemstone Company stands behind the gem with full disclosure of treatments and origin, and we welcome inquiries about certification, matching stones, or custom mounting options, we invite the serious buyer to examine digital magnification images or request an independent gemological report to confirm the qualities described and to ensure confidence in the purchase.