6.76 Ct. Bluish Green Prasiolite from Brazil

This prasiolite, presented by The Natural Gemstone Company, is a transparent, bluish green example of quartz, weighing 6.76 carats, fashioned into a round shape with precise dimensions of 12.44 by 12.44 by 8.19 millimeters. The cutting style is faceted, executed as a mixed brilliant cut to balance scintillation and depth of tone, and the surface finish is an excellent polish that enhances light return. Clarity is described as very slightly included, evaluated at eye level, indicating only minor internal features that do not detract from overall transparency. Color intensity is rated as intense, and the piece has undergone heat treatment, a documented enhancement that stabilizes and intensifies the green hue, while its origin is Brazil, a region known for producing high quality quartz varieties.

The geological narrative of this prasiolite begins millions of years ago within the crustal environment of what is now Brazil, where tectonic processes created pathways for silica rich hydrothermal fluids to migrate and concentrate. In those deep, pressurized settings, silica saturated solutions slowly cooled within fractures and cavities in host rocks, allowing quartz crystals to nucleate and grow over extended time frames. Trace elements and subtle impurities present in the growth medium, including iron and perhaps other transition elements, influenced light absorption in the crystal lattice, contributing to the bluish green tonalities that distinguish this specimen. Over successive geological epochs, burial and tectonism exposed the host veins to varying temperatures and pressures, and natural thermal events altered color centers within the quartz. In some prasiolites, geological heating can induce a stable green shade, while in others a controlled heat treatment applied later by human hands refines the color to the intense bluish green observed here. This specimen therefore embodies a dual chronology, one deep time geological history that produced the crystal framework, and a modern, documented enhancement that completes its present appearance.

The lapidary work on this round prasiolite respects both the material properties of quartz and the optical objectives of a mixed brilliant cut. The cutter oriented the pavilion and crown facets to optimize return of light through the table, balancing dispersion and contrast so that the perceived color remains even and saturated when viewed face up. The excellent polish minimizes surface scattering, allowing the stone to exhibit a clear, lively face up appearance despite the presence of very slight inclusions visible only at eye level. Those minor inclusions are consistent with natural growth features, and they contribute to the gemological provenance of the piece without materially affecting brilliance or structural integrity. Dimensions of 12.44 by 12.44 by 8.19 millimeters place this stone in a size class that reads proportionally large when set, and the weight of 6.76 carats reflects the density and cut proportions that maintain a visually substantial presence while preserving optimal light performance.

Provenance from Brazil situates this prasiolite in a well documented supply chain that The Natural Gemstone Company monitors for quality and ethical sourcing. The heat treatment enhancement applied to this stone is a common, stable intervention for prasiolite, and documentation is provided to disclose that enhancement while explaining its purpose in stabilizing and intensifying the natural color. For care, standard precautions for faceted quartz apply, avoid prolonged exposure to high heat or harsh chemicals, clean with warm soapy water and a soft brush, and remove during activities that could subject the stone to sharp knocks. When considering settings, the mixed brilliant cut and excellent polish lend themselves to both solitaire and halo designs, the round proportions allowing secure bezel or prong mounts that protect the girdle while showcasing the intense bluish green face up color. This prasiolite offers both a geological story that spans millions of years and a recent history of careful lapidary refinement, a combination that reflects The Natural Gemstone Company commitment to presenting natural minerals with clarity regarding origin, treatment, and gemological character.