5.97 Ct. Bluish Green Prasiolite from Brazil

This listing presents a single transparent bluish green prasiolite weighing 5.97 carats, oval shape with dimensions 12.99 x 10.40 x 7.69 mm, faceted with a mixed brilliant cut, graded eye clean at typical viewing distance, showing intense color intensity, and finished with an excellent polish. The gem has undergone controlled heat treatment, a standard and stable enhancement for prasiolite, and originates from Brazil. Photographs and measurements are provided for accurate appraisal and for planning of settings. The Natural Gemstone Company confirms the stated properties based on our internal gemological assessment, and the stone is supplied with the visual and dimensional attributes described above.

The mixed brilliant cutting style used on this piece balances table and crown facet proportions with a well formed pavilion, which optimizes light return for a quartz material. The relatively low refractive index typical of quartz allows the stone to display a clear, glassy brilliance that is perceptibly bright in both daylight and artificial lighting. The excellent polish produces crisp facet junctions and minimizes surface diffusion of light, which enhances both contrast and flash. The eye clean clarity grade allows unobstructed light paths through the pavilion, increasing apparent brightness and internal scintillation. The intense bluish green hue concentrates color saturation without significantly diminishing overall brilliance, a characteristic that benefits from the even facet pattern and the mixed brilliant layout.

When comparing reflective behavior to other green gemstones commonly considered in the same category for jewelry, prasiolite exhibits a distinct optical profile. Quartz, including prasiolite, has a refractive index in the range of approximately 1.544 to 1.553 and a low dispersion value, resulting in modest fire and a predominantly white sparkle rather than colorful flashes. By contrast, tourmaline typically shows a higher refractive index, and when well cut it will return greater brilliance and stronger contrast between bright and dark areas. Peridot has a higher refractive index and notable birefringence, which can create a lively doubling effect and pronounced flashes under changing light. Emeralds, even when relatively clean, often appear less brilliant than prasiolite because they typically carry more inclusions that interrupt light transmission, and their optical character emphasizes depth of color over outward sparkle. Sapphires display the highest refractive index among these comparators, producing the greatest overall brilliance, but their deeper tones and different cutting conventions yield a more saturated and sometimes more velvety appearance than the crisp, glass like radiance of prasiolite.

In practical terms for design and wear, prasiolite offers a predictable and versatile reflective quality. Its vitreous luster and steady white brilliance respond well to faceting styles that favor larger table facets paired with well proportioned pavilion facets, as is the case with this mixed brilliant cut. The stone will show clean flashes and even scintillation in movement, with a more subtle spectrum of color play than higher dispersion gems. Because quartz has moderate hardness and good toughness, this prasiolite is suitable for everyday wearable pieces such as rings and pendants when set with protection in mind. It benefits from secure settings and occasional maintenance to retain the excellent polish and to preserve the visual relationship between color intensity and light return. The heat treatment applied is stable, and the origin from Brazil is consistent with known prasiolite sources that yield uniform color saturation when properly processed.

For clients and designers seeking a green gem that emphasizes transparent, intense color and consistent, glass like brilliance rather than intense fire, this 5.97 carat prasiolite is an exemplary option. The combination of precise dimensions, a mixed brilliant cut, eye clean clarity, and excellent polish maximizes the optical performance inherent to quartz, producing an elegant, luminous green that reads clearly in both close inspection and in mounted presentation. The Natural Gemstone Company includes provenance and treatment notes to support responsible selection, and we are available to provide additional imaging, mounting recommendations, or matching considerations for complementary gems. This prasiolite will perform as a reliable and visually appealing center stone where clarity and pure, reflective color are the primary design goals.