5.48 Ct. Bluish Green Prasiolite from Brazil

This prasiolite offered by The Natural Gemstone Company is a transparent, bluish green round gem weighing 5.48 carats, with exact dimensions of 11.83 by 11.95 by 7.12 millimeters, cut in a precision faceted style with a mixed brilliant cut, clarity evaluated as eye clean at standard viewing distance, color intensity described as intense, and an excellent polish. The piece originates from Brazil, and the material has been stabilized and color enhanced by controlled irradiation, a common industry practice to develop and fix the desirable bluish green hue in quartz varieties. Physically the gem benefits from the inherent durability of the quartz family, with a Mohs hardness of about 7 and a specific gravity around 2.65, and optically it responds to light in a way typical for prasiolite, with a refractive index in the range expected for quartz. The round mixed brilliant configuration presents the best balance between scintillation and color saturation for this material, the cutting strategy chosen deliberately to exploit the stone's transparency and intense color while maintaining robust durability for setting.

To appreciate this stone fully it helps to imagine its formation over geological time. Millions of years ago silica rich fluids percolated through fractures and cavities in volcanic and metamorphic host rock in the Brazilian terrane, carrying dissolved silica and trace amounts of iron and other transition elements. As temperature and pressure conditions shifted, quartz began to crystallize from those hydrothermal solutions, forming well developed euhedral crystals and drusy coatings in vugs and veins. Iron impurities and lattice defects became incorporated at the point of growth, setting the stage for later color modification. Over subsequent geological cycles of burial and uplift natural radiation from surrounding radioactive minerals altered electron configurations in the silica lattice, producing faint green tones in rare localities. In modern practice the color is reliably reproduced and intensified by controlled irradiation in order to achieve a stable bluish green that meets market expectations, while still preserving the natural crystalline structure and optical properties that formed deep in the earth.

The cutting and finishing of this 5.48 carat round prasiolite was executed with technical precision to maximize both light return and chromatic depth. The mixed brilliant philosophy applied here employs a brilliant facet schema on the crown to generate lively dispersion and scintillation, paired with a controlled step or modified pavilion arrangement to deepen apparent saturation and extend color through the gem body. The cutter adhered to strict proportional tolerances, producing a depth ratio of approximately 60 percent relative to the mean girdle diameter, a proportion that optimizes the interplay between brilliance and hue for quartz refractive indices. The pavilion and crown facets meet in crisp junctions, the girdle is proportioned for secure setting without excessive weight loss, and the table plane is sized to balance face up brightness with color concentration. The surface polish was brought to an excellent finish, ensuring minimal light scatter and maximum luster. Because the color is irradiation induced, the tone and saturation are stable under ordinary wear and indoor lighting, but like all quartz materials treated by irradiation this prasiolite should be protected from prolonged exposure to extreme heat or prolonged direct sunlight to maintain optimum color. For clients who appreciate geological provenance, technical cutting rationale, and dependable enhancement disclosure, this Brazilian prasiolite represents a fine intersection of natural history and exacting gemcraft, and it is offered with the integrity and detailed attention to specification that collectors and jewelers expect from The Natural Gemstone Company.