0.91 Ct. Alexandrite from Ceylon (Sri Lanka)

This 0.91 carat oval alexandrite from Ceylon Sri Lanka presents as a transparent gem with dimensions of 7.25 by 5.18 by 3.31 mm, a mixed brilliant cut, and a clarity grade of slightly included as evaluated at eye level. The mixed brilliant execution employs a brilliant facet arrangement on the crown paired with modified step facets on the pavilion, a deliberate balance that promotes both scintillation and controlled color saturation. The vivid color intensity is evident in the documented bluish to purplish shift, a natural chromium driven color change that remains unenhanced, and the excellent polish ensures crisp facet junctions and minimal surface diffusion of light. Slight inclusions are present at eye level, yet they do not materially impede the stone s ability to return light, instead maintaining a transparent appearance suitable for close inspection and fine jewelry settings. Provenance and treatment status are significant, and this specimen is natural and untreated, supplied by The Natural Gemstone Company with full disclosure of origin and enhancement status.

When assessing brilliance relative to more common gemstones, the optical character of alexandrite is distinct. Chrysoberyl as a species has a high refractive index in the range of 1.746 to 1.755 and low birefringence around 0.008, which together yield sharp internal contrast and well defined flashes comparable to sapphire and superior to many garnets and tourmalines. Dispersion is modest at approximately 0.012, so alexandrite s play is less about spectral fire and more about strong dichroic color separation and scintillation. Against diamond, which offers the highest dispersion and unmatched fire, this alexandrite stands apart by delivering a dramatic daylight to incandescent color change that diamonds cannot exhibit. Versus sapphire and ruby, which offer saturated single hue brilliance, this alexandrite s mixed cutting scheme enhances color shift and directional flashes, creating dynamic visual performance that is both lively and complex. For collectors and connoisseurs who value optical nuance, this 0.91 carat oval offers rare color behavior combined with precision cutting and excellent polish, making it an exceptional choice for a bespoke piece or a focused addition to a gemstone collection, backed by The Natural Gemstone Company and full treatment disclosure.