9.57 Ct. Alexandrite from Ceylon (Sri Lanka)

This transparent 9.57 carat oval alexandrite from Ceylon offered by The Natural Gemstone Company presents a rare combination of size, eye clean clarity, and intense color intensity, all in a carefully executed mixed brilliant cut. Measuring 14.44 by 11.56 by 6.73 millimeters, the stone displays a notable color change from green in daylight and fluorescent lighting to a brownish yellow under incandescent lighting, a characteristic produced by chromium related absorption within the chrysoberyl crystal structure. The mixed brilliant cut is tailored to balance color and return of light, with a brilliant style pavilion that enhances scintillation, and a crown arrangement that preserves the depth and saturation of the color change. The clarity grade of eye clean at typical viewing distances indicates minimal internal inclusions, maximizing light transmission and contributing to crisp facet contrasts. The polish is excellent, which improves surface reflection and ensures the stone shows its best luster in jewelry settings, and the absence of any treatments or enhancements further increases its desirability for collectors and connoisseurs who prioritize natural material and provenance.

In comparing reflective qualities to other gemstones in its category, this Ceylon alexandrite offers an adamantine luster and strong facet-based brilliance that differs from the softer glow of emeralds and the broader, more even sparkle of sapphires. Compared with Russian and Brazilian alexandrites, which can show more pronounced red to purple changes, Ceylon material often leans toward brighter greens with secondary yellow or brown tones, and this example sits at the intense end of that spectrum, offering lively reflectivity without the heavy dark tones that reduce apparent brilliance. Against other color change stones and chrysoberyl group gems, the high polish and mixed brilliant design of this piece maximize both color play and flash, producing sharp, mirror like facet reflections and lively scintillation under mixed lighting. For the educated buyer this specimen is valuable because of its near ten carat weight, natural provenance, eye clean clarity, lack of enhancement, and precise cutting, features that together improve light performance and long term value. For set design, an open gallery mounting will allow the full color change and brilliance to be experienced, while a well proportioned bezel or prong setting will protect the stone without diminishing its reflective properties.