3.05 Ct. Brown Cabochon Chrysoberyl from Ceylon (Sri Lanka)

This translucent oval chrysoberyl weighs 3.05 carats, with calibrated dimensions of 7.75 x 7.14 x 5.61 millimeters, and it has been fashioned as a classic cabochon cut to maximize optical phenomena. Origin certified as Ceylon Sri Lanka, the material displays an intense brown body color with uniform saturation across the dome, and the piece is graded as very slightly included at eye level. No enhancement has been applied to this specimen, and the polishing quality is assessed as excellent, yielding a mirror smooth surface that interacts with incident light without scattering. Chrysoberyl is a durable species with a Mohs hardness of 8.5, and it exhibits a refractive index in the range of approximately 1.746 to 1.755 with low to moderate dispersion, characteristics that contribute to crisp internal reflections and resistance to wear. The crystal system is orthorhombic, and that inherent structural order supports the formation of linear, oriented inclusions which are critical to the cat eye effect present here. The careful preservation of the natural orientation during preforming and the precise control of dome geometry by our lapidary team are central to the optical performance you see, and these decisions are informed by microscopic inspection of inclusion alignment and cleavage orientation before the final smoothing and polishing stages.

The cabochon geometry on this stone has been optimized to produce a sharp, mobile chatoyant band that transects the dome with a high degree of definition. Chatoyancy in chrysoberyl arises from abundant, closely spaced, needle like or fibrous inclusions aligned parallel to one another, and when those inclusions are oriented perpendicular to the viewing direction they reflect light coherently to form a narrowly confined eye. The combination of chrysoberyl s relatively high refractive index and the uniform, well oriented inclusion plane in this specimen concentrates reflected light into a luminous, well localized band that appears to glide across the surface as the viewing angle changes. Translucency is sufficient to allow back scatter yet controlled enough to provide contrast, so the eye remains crisp against a softly luminous ground color rather than diffusing into a broad, indistinct sheen. The dome height and curvature have been chosen to balance two competing optical requirements, one being a sufficient dome to present a continuous planar reflection from the inclusion plane, and the other being a moderate thickness that preserves translucency to allow internal light return. The excellent polish minimizes surface scattering and enhances specular reflection, producing a striking, razor sharp eye under direct illumination and a stable, coherent band in more diffuse light, traits that place this piece among the superior chatoyant chrysoberyls encountered in the market.

Craftsmanship details are critical to realizing and preserving the optical qualities of a chatoyant cabochon, and this stone demonstrates deliberate control over preform symmetry, base flatness, dome axis alignment, and final polish. The lapidary workflow began with orientation of the rough so that the needle inclusion plane would be parallel to the intended base, a step that is essential to achieve the strongest possible cat s eye when the dome is cut perpendicular to that plane. The oval outline provides a pleasing visual length that accentuates the band while maintaining consistent curvature at the shoulders, and the finished proportions support secure bezel setting without occluding the axis of chatoyancy. Given the stone s clarity grade of very slightly included at eye level, inclusions are minimal and contribute to the characteristic band without compromising structural integrity, reducing risk of fracture during setting and wear. For mounting we recommend a bezel setting that follows the dome profile closely, keeping the band visible along the exhibition axis and offering protection to the rounded girdle. The Natural Gemstone Company stands behind the provenance, cut quality, and absence of enhancement for this piece, and we can provide guidance on orientation for setting, photographic capture techniques to show the band to best effect, and routine care which involves avoiding ultrasonic cleaning and extreme thermal shock. This cabochon is a technically refined example of Sri Lankan chrysoberyl where mineral structure, controlled lapidary technique, and exacting polish converge to produce a cat s eye with unmatched precision and enduring wearability, and we invite you to contact The Natural Gemstone Company for additional measurements, viewing angles, or custom mounting recommendations.