14.21 Ct. Yellowish Green Prasiolite from Madagascar

This 14.21 carat prasiolite, cut in a classic emerald cut shape, presents precise geometry and substantial presence, with dimensions of 15.54 by 12.04 by 10.81 millimeters. The length to width ratio is approximately 1.29, creating a balanced rectangular face that emphasizes broad step facets rather than table scintillation, and the depth to average diameter is approximately 78 percent, which contributes to a strong window of color and well defined hall of mirrors reflections. The stone originates from Madagascar, and it has been heat treated to develop and stabilize its yellowish green hue, a standard and stable enhancement for prasiolite that produces even saturation and predictable behavior under normal wear. Clarity is graded as very slightly included at eye level, which indicates that inclusions are minor and do not materially interrupt transparency, and the excellent polish results in crisp facet junctions and mirror bright facet surfaces that maximize light return from each step facet plane.

From an optical and technical standpoint this prasiolite behaves as quartz with a refractive index in the expected range for quartz minerals, producing a vitreous luster and glass like light return that excels in transparency and broad flashes. The emerald cut intensifies these traits by organizing light into large planar reflections rather than the dispersed scintillation seen in brilliant cuts, so the viewer experiences strong linear flashes and contrasty light bands that emphasize color and clarity. Compared to diamond, which has a much higher refractive index and stronger dispersion creating intense sparkle, this prasiolite offers a different aesthetic, favoring elegant broad flashes and a deep hall of mirrors effect rather than tight pinpoint scintillation. Compared to green tourmaline and peridot, its medium color intensity and yellowish green tone are typically cooler and more subdued, with fewer chromatic variations and less birefringence, which means images through the stone remain undoubled and edges appear crisp. Relative to emerald, prasiolite has greater toughness for everyday wear, and because of the step cut and very slightly included clarity grade, this specimen reads as a clean, high transparency gem with controlled light performance and a refined optical signature.

For the connoisseur who values cutting technique and material behavior, this Madagascar prasiolite offers a technically satisfying package, ideal as a centerpiece where the emerald cut geometry and excellent polish will be showcased, and where its size at 14.21 carats commands design attention. The step facet architecture provides predictable locus points for inclusion placement, which the cutter has managed to place to minimize visual impact at normal viewing angles, and the heat treatment applied is a stable enhancement that preserves the gem over time without surface coatings or unstable treatments. When set in ring or pendant designs that protect the corners and allow the table to receive direct light, the stone will consistently display large mirrored flashes and a pleasing, even color field that photographs well and presents attractively in person. The Natural Gemstone Company invites laboratory minded buyers to examine this prasiolite under loupe and daylight conditions to assess its facet symmetry, polish quality, and inclusion habit, and we stand ready to provide detailed imagery and measurement verification to support its technical attributes and provenance.