1.93 Ct. Chrysoberyl from Ceylon (Sri Lanka)

This transparent 1.93 carat cushion shape chrysoberyl from Ceylon presents with precise proportions and a lively presence, measuring 8.01 x 7.52 x 3.75 mm. The stone is finished with a mixed brilliant cut and an excellent polish, a combination that maximizes both brightness and controlled color presentation. Clarity is evaluated as very very slightly included at eye level, which allows the gem to remain visually clean while retaining a natural internal character that does not impede light return. The color is an intense yellowish green, uniformly distributed and free of treatments, with a verified no enhancement declaration. The Natural Gemstone Company offers this gem as an example of careful selection and cutting that respects the material as it occurs in nature, preserving its origin and intrinsic qualities.

The chrysoberyl crystal structure contributes directly to the gem s exceptional sparkle. Chrysoberyl has the chemical composition BeAl2O4 and crystallizes in the orthorhombic system, a lattice that yields a relatively high refractive index in the range of approximately 1.746 to 1.755. This high refractive index produces strong internal reflection from each well formed facet, creating pronounced brilliance. Birefringence in chrysoberyl is modest, roughly 0.008, which minimizes double images and maintains sharp, crisp facet reflections when the stone is properly oriented and cut. Dispersion is moderate, about 0.014, so the gem shows measured flashes of spectral color that support rather than overpower its yellowish green saturation. The mixed brilliant cut accentuates these physical properties by combining a brilliant faceted crown that scatters and returns light with a more geometric pavilion that controls light leakage. With an excellent polish the facet planes act as mirrors, enhancing contrast between light and dark facets, and the very very slightly included clarity permits almost uninterrupted passage of light through the pavilion, producing concentrated scintillation and a lively return of light to the eye.

Because chrysoberyl ranks approximately 8.5 on the Mohs hardness scale, it offers notable durability for everyday wear while maintaining the ability to take a fine polish that supports intense luster. In practical terms the cushion outline moderates light distribution across the table and crown, producing a broad flash when viewed face up and intricate scintillation when the stone is tilted. The combination of intense, transparent color and strong facet contrast is what gives this gem a sparkle that reads as distinct from more common gem species. Compared to gems with lower refractive indices, the internal reflections are denser and more defined, while the modest dispersion avoids excessive fire that can dilute the stone s inherent hue. For secure and flattering settings a low to medium bezel or a partial bezel with open pavilion windows will protect the stone while permitting the exchange of light needed for optimal brilliance. The Natural Gemstone Company stands behind the natural origin and untreated state of this Ceylon chrysoberyl, and recommends professional setting and routine cleaning with mild soap and warm water to preserve the cut and polish that generate its unmatched sparkle.