3.90 Ct. Bluish Green Prasiolite from Brazil

This prasiolite presents as a transparent, oval shape weighing 3.90 carats, with exact dimensions of 11.41 by 9.56 by 6.24 millimeters, and a depth proportion of approximately 60 percent. The cutting style is faceted, executed in a mixed brilliant design that combines a brilliant crown with a controlled step pavilion. This faceting strategy is selected to maximize both scintillation and saturation, delivering intense color intensity while minimizing windowing. The crown facets are cut to precise angles to create strong return of light and lively dispersion, while the pavilion steps are calibrated to reinforce color saturation through controlled light leakage. The result is an eye clean gem when evaluated at normal viewing distance, with a clarity grade designated as eye clean. Polish is excellent across all facets, producing crisp facet junctions and a clean table surface that readies the stone for close inspection. The material is an irradiated prasiolite from Brazil, and the color treatment was applied in a controlled irradiation process that yields a stable bluish green tone. This combination of well judged proportions, advanced faceting choices, and finish quality is typical of the standards maintained by The Natural Gemstone Company.

The most distinguishing attribute of this prasiolite is its internal signature, created by a constellation of inclusions and growth features that are both diagnostic and attractive. Under 10 times magnification, one encounters a network of fine, acicular inclusions aligned parallel to the crystal growth axis, consistent with chloritic and fibrous mineral growth. These needles assemble into faint, featherlike sheaves that produce a soft internal texture, visible as a delicate green silk when light travels along the long axis. Interspersed among these needles are discrete two phase fluid inclusions that appear as tiny negative crystals with a gas bubble and a brine pocket. These three phase inclusions act as micro mirrors and bubble lenses, scattering light within localized volumes and creating micro scintillation that complements the facet derived sparkle. In addition there are minute micaceous platelets and feathery hematitic films sitting on growth planes, which produce subtle metallic flashes at certain viewing angles. A small number of healed tension fractures are present, displaying reflective internal surfaces that have been naturally reannealed during crystal growth and mining. These healed features are stable and give the stone an identifiable fingerprint, a pattern of internal lamination and reflective veils that is commonly associated with high quality Brazilian prasiolite. Importantly these inclusions contribute to the stone character without compromising transparency to the point of affecting the eye clean grade. Instead, they enrich the visual complexity, imparting a layered depth and a signature that a trained loupe inspection can recognize as provenance and formation history.

The cutter has intentionally oriented the oval axis and facet layout to showcase this inclusion signature while preserving optimal light performance. By aligning the pavilion facets with growth direction and employing a mixed brilliant pattern, the cutter amplifies the prasiolite color and the three dimensional play of internal features. The crown and table proportions are balanced to present the bluish green saturation at face up, while allowing the internal chloritic sheens and fluid inclusions to add texture rather than distraction. From a gemological perspective the irradiated color is stable under ordinary wear, however the stone should be protected from sustained high heat that could alter the induced chromophore state. For jewelry applications we recommend settings that protect the girdle and pavilion margins, such as bezel or secure prong work with metal collars, to minimize the potential for mechanical impact on the healed fracture networks. The Natural Gemstone Company presents this prasiolite as a collector grade piece for those who appreciate both optical performance and geological narrative. Its Brazilian origin, mixed brilliant faceting, eye clean clarity, intense color intensity, and the unmistakable internal signature make it an exceptional example of treated green quartz that will appeal to connoisseurs who value documented craftsmanship and identifiable gemological character.