11.34 Ct. Bluish Green Prasiolite from Brazil

This prasiolite is a single, transparent, emerald-cut gem weighing 11.34 carats with dimensions of 15.26 by 11.98 by 9.06 millimeters. The cutting style is faceted with an emerald cut profile, and the stone presents an intense bluish green hue across a broad table. Clarity is graded as eye clean at typical viewing distances, and the surface displays an excellent polish that contributes to crisp facet junctions and well-defined light return. The stone has been heat treated, a common and stable enhancement for prasiolite, applied to achieve a consistent and saturated green tone. These objective specifications together create a gem that reads as a substantial, high-clarity center stone, ideally suited for designs that emphasize breadth of color and architectural facet structure rather than scintillation-based brilliance alone.

The emerald cut and the proportions of this piece work coherently to present both color depth and a refined, geometric appearance. With a depth of 9.06 millimeters relative to a length of 15.26 millimeters, the stone sits in a proportion range that preserves color saturation without appearing overly shallow or deep once set. The step facets characteristic of the emerald cut form large, mirror-like planes that emphasize the prasiolite’s bluish green tone and produce the classic “hall of mirrors” effect appreciated in step-cut gems. Because the material is eye clean, the broad, open facets do not reveal internal interruptions, allowing the color to read uniformly across the table and pavilion. The excellent polish enhances visual crispness at facet edges and contributes to controlled light return, which is particularly important in a gem of this size where facet precision directly influences overall visual harmony and perceived quality.

The Brazilian origin of this prasiolite contributes materially to its desirability and intrinsic value. Brazil, and Minas Gerais in particular, is a globally recognized source for high-quality quartz varieties, including prasiolite, due to its unique pegmatitic and hydrothermal environments that yield large, well-formed crystals. Gemstones originating from Brazil often benefit from both geological conditions that favor sizable, clean material and an established lapidary infrastructure capable of producing precise cuts and superior finishes. Provenance from Brazil therefore adds assurance about the starting material quality and the likelihood that the rough permitted the cutter to retain weight while achieving symmetrical facet placement and superior polish. At The Natural Gemstone Company we document origin as part of our quality assurances, and the Brazilian provenance of this prasiolite is a meaningful factor for collectors and designers who require clarity in supply chain and confidence in the material characteristics that underlie performance in finished jewelry.

From a practical and design standpoint this stone offers both versatility and reliability. Prasiolite is a variety of quartz with a Mohs hardness of approximately 7, which affords reasonable resistance to everyday wear when set properly, though it is not as hard as corundum or diamond and should be protected from hard knocks and abrasive contact. The emerald cut’s low profile and step facets make this piece particularly well suited to secure settings such as four- or six-prong mounts, bezel-adjacent designs, or semi-bezel frameworks that balance protection with visibility. The bluish green tone pairs effectively with both white and yellow metals; in white metals the color appears cooler and more teal, while warmer settings will emphasize the green aspect and offer a classic contrast. Care for heat-treated prasiolite is straightforward: clean with warm, soapy water and a soft brush, avoid prolonged exposure to intense heat or strong ultraviolet environments, and handle with the same precautions you would apply to any fine colored stone to preserve polish and color saturation. Should you require further technical details, matching stones, or bespoke mounting recommendations, The Natural Gemstone Company can provide additional images, measurements, and guidance to ensure the final setting complements the gem’s optical character and proportions.