6.21 Ct. Bluish Green Prasiolite from Brazil

One transparent pear shape prasiolite, weighing 6.21 carat, presents a refined bluish green hue with vivid color intensity, dimensions of 14.32 x 10.75 x 7.83 mm, and a faceted mixed brilliant cutting style. The gem displays a clarity grade of very very slightly included, evaluated at eye level, and an excellent polish that enhances surface luster. The piece has been irradiated as an enhancement to stabilize and intensify the green tone, and its documented origin is Brazil. Cut as a pear to balance length and width, the stone is proportioned to maximize table presence and to integrate an attractive crown and pavilion geometry. The mixed brilliant design combines a brilliant crown facet arrangement with a modified pavilion, producing a controlled play of light that benefits both face up appearance and internal scintillation.

The optical performance of this prasiolite is a product of material properties and precision cutting. Quartz family stones, including prasiolite, have a refractive index that is lower than that of common high brilliance stones such as diamond and certain garnets. Despite this, a well executed mixed brilliant cut compensates for the lower refractive index by optimizing facet angles for maximum return of incident light. The excellent polish reduces surface scattering, and the very very slightly included clarity at eye level means there are minimal internal interruptions to light paths. Together these characteristics create a lively gem with defined flashes of sparkle, clean window areas, and measured contrast between bright and dark facets. In practical terms the gem exhibits a consistently attractive face up brightness under a range of lighting conditions, and the vivid bluish green colour enhances perceived luminosity by increasing chromatic contrast.

When compared to more commonly encountered gemstones the prasiolite’s brilliance should be understood in context. Diamond remains the benchmark for brilliance and fire due to its high refractive index and dispersion, therefore diamonds will exhibit stronger scintillation and spectral flash. Corundum varieties such as sapphire display substantial light return and strong colour saturation, while green beryl such as aquamarine tends to show a more subtle, crystalline glow with slightly different light transmission because of its beryllium aluminium silicate structure. Tourmaline and peridot typically have higher refractive indices than quartz, producing more pronounced brilliance per facet. What allows this prasiolite to stand out is the combination of its vivid bluish green hue, its substantial 6.21 carat weight and its mixed brilliant faceting. The cut amplifies internal reflection and scintillation relative to a standard step cut, and the transparent nature of the specimen together with very good clarity yields a bright, lively appearance that reads as vibrantly green and visibly lively, particularly in direct and diffused lighting where colour and facet contrast work together to engage the eye.

The treatment and origin of this stone are important considerations for long term stability and value assessment. Irradiation is a common and stable enhancement used to develop or enhance the green tone in prasiolite sourced from Brazil, and when properly carried out it produces a color that is not prone to rapid fading under normal wear. The material is a form of quartz with a Mohs hardness of approximately seven, which provides respectable resistance to everyday wear while still requiring sensible care. Avoid prolonged exposure to strong heat sources, avoid ultrasonic cleaning if inclusions are a concern, and clean with warm, soapy water and a soft brush. When setting the gem, protective bezel or partial bezel settings and secure prongs are advisable for supporting the pear shape and protecting the pointed end. The Natural Gemstone Company provides provenance information and quality documentation upon request to assist with assurance and insurance needs.

In summary the 6.21 carat pear shape bluish green prasiolite from Brazil combines clear, transparent material, vivid colour intensity, very very slightly included clarity at eye level, excellent polish, and a mixed brilliant cut to deliver a lively, well proportioned gem. The stone’s optical performance is notable because the cutter has maximized facet geometry to compensate for the intrinsic refractive properties of quartz, producing attractive scintillation and face up brightness that compares favorably to more muted green gemstones and provides a distinct alternative to higher refractive index stones for those seeking colour and presence. For further technical information, additional images or to discuss custom mounting options, please contact The Natural Gemstone Company and we will provide detailed assistance and documentation.