13.30 Ct. Bluish Green Prasiolite from Madagascar

Millions of years ago, silica rich fluids migrated through fractures and cavities in the metamorphic and pegmatitic terranes of Madagascar, depositing successive layers of quartz as temperature and pressure fluctuated. Trace transition metal impurities and natural radiation produced color centers in the growing crystals, imprinting subtle hues that would later respond to thermal modification. Over geological time, slow crystal growth produced large, transparent quartz crystals with exceptional clarity and structural integrity, preserving internal zoning and minute inclusions that document their deep time history. The rough material that became this prasiolite was extracted from those ancient veins, its original crystal chemistry and inclusion suite indicating a complex history of burial, uplift, and localized hydrothermal activity, and its current bluish green face up color was realized after controlled heat treatment applied by skilled technicians.

This specimen is a transparent 13.30 carat cushion shape prasiolite, measuring 17.75 by 12.83 by 9.69 mm, faceted in a mixed brilliant style with a brilliant facet scheme on the pavilion and a modified stepped crown, a combination chosen to intensify face up color while preserving scintillation and depth. The cutter at The Natural Gemstone Company calibrated pavilion angles and crown heights to balance light return with color saturation, producing a vivid color intensity and a pleasing window free appearance. Clarity is graded very very slightly included evaluated at eye level, the minimal inclusions are relegated to the girdle region and do not detract from the overall transparency or optical performance, and the polish is excellent, delivering crisp facet junctions and lively facet reflections. Enhancement is heat treated, a stable and standard practice for prasiolite that converts pre existing color centers into the desirable bluish green tone without compromising structural stability. Origin is Madagascar, and the combination of geological provenance, precise mixed brilliant cutting, vivid color intensity, and expert finishing makes this prasiolite a technically refined choice for connoisseurs seeking a substantial, visually dynamic gem for bespoke rings or statement settings.