4.97 Ct. Yellowish Green Prasiolite from Brazil

Deep in the Precambrian basement of what is now Brazil, silica rich fluids migrated through fractures in igneous and metamorphic host rocks, depositing quartz over prolonged intervals measured in millions of years. Under steady thermal gradients and low to moderate pressure, clear quartz grew as euhedral crystals within open cavities and veinlets, layer by layer, incorporating trace elements and subtle structural defects that would later influence color response. Subsequent tectonic activity and regional metamorphism fragmented and reworked these quartz masses, while secondary hydrothermal pulses introduced minute quantities of iron and other transition elements that predisposed certain zones to develop a yellowish green hue when exposed to thermal alteration. The material that became this 4.97 carat round prasiolite originated in that long geological sequence, its crystalline lattice forming slowly enough to produce high transparency, and its eventual color arising from trace chemistry combined with controlled heating, a technique used to stabilize and intensify the yellowish green tone found in prasiolite.

The finished gemstone on offer from The Natural Gemstone Company is a transparent, round shape, yellowish green prasiolite, weighing 4.97 carats, with dimensions of 11.66 by 11.31 by 6.80 mm, faceted in a mixed brilliant cut to balance overall brilliance and scintillation. The mixed brilliant design uses a multi facet crown above a finely proportioned pavilion, preserving a generous table to showcase the medium color intensity, while pavilion facet angles and depth were optimized to maximize light return for quartz, given its refractive properties. The stone is eye clean when evaluated at eye level, and the cutter achieved an excellent polish, producing crisp facet junctions and minimal surface distortion, which enhances both transparency and the perception of color. Enhancement by controlled heat treatment is noted, this treatment stabilizes and refines the yellowish green hue typical of prasiolite sourced from Brazil, and the material is well suited to precision settings where the mixed brilliant cut will interact with directional lighting to reveal both even body color and lively internal reflections. This specimen represents a convergence of ancient geological processes and modern lapidary craftsmanship, offered with the provenance and standards associated with The Natural Gemstone Company.