1.72 Ct. Black Cabochon Cat’s Eye Kornerupine from Ceylon (Sri Lanka)

This exceptional translucent 1.72 carat oval black kornerupine measures 8.92 x 5.61 x 3.95 mm, and is cut as a cabochon to showcase its internal character and chatoyant properties, clarity graded as very very slightly included at eye level, medium color intensity, and finished with an excellent polish. Originating from Ceylon Sri Lanka, this piece is notable for being untreated, with no enhancements, which preserves its natural optical attributes and makes it particularly desirable for collectors and connoisseurs who prioritize untreated gem material. The cabochon cutting style is the classical choice for gemstones that exhibit chatoyancy or subtle internal structure, because the smooth domed surface allows light to play across the stone and reveal the compelling internal band of light that defines the cat’s eye effect. At 1.72 carats and with the oval proportions listed, this kornerupine has a presence suitable for both statement rings and refined pendants, where the stone can be mounted to optimize viewing angles and illumination.

The cat’s eye effect, or chatoyancy, in this kornerupine presents as a single, sharp band of reflected light that traverses the surface of the cabochon, moving across the stone as the viewing angle or light source changes. Chatoyancy arises from parallel fibrous inclusions or aligned needlelike structures within the mineral, and because this gem is translucent rather than opaque, the light interacts with those internal features to create a luminous stripe that appears to float above the body color. The quality of the cat’s eye depends on symmetry, alignment, and the uniformity of the internal structures, and this specimen displays a well defined, centered band of light that remains visible under typical indoor and outdoor lighting. For practical considerations, the band is most vivid when a concentrated light source is directed across the dome, and it becomes a focal point in motion, drawing the eye and signaling the gem’s dynamic optical behavior. Even with a clarity grading of very very slightly included at eye level, these minor inclusions are responsible for the chatoyant phenomenon and do not detract from the gem’s attractiveness, rather they enhance its character and rarity.

Color plays a central role in how a gemstone will register in jewelry, and this kornerupine’s medium color intensity gives it a deep, saturated black that reads as both dramatic and versatile. The term vibrant when applied to a dark stone refers to its capacity to convey depth, luster, and the crispness of its chatoyant band, and in this case the interplay of the rich dark body color and the luminous cat’s eye results in a strong visual impact that will stand out in any jewelry setting. Against warm metals like yellow gold the black body becomes a striking contrast, while white metals such as platinum or white gold offer a contemporary backdrop that emphasizes the stone’s sheen and the sharpness of the light band. To enhance the cat’s eye effect designers often choose settings that leave the cabochon surface exposed, orienting the stone so that the band runs vertically or horizontally relative to the wearer, depending on whether a ring or pendant is planned. For those considering accent stones, pairing this kornerupine with white opal is an elegant choice, since white opal provides a soft milky body tone and a play of color that contrasts with the kornerupine’s dark drama. White opal typically exhibits a light body color, a gentle translucency, and often a subtle play of spectral color depending on cut and quality, and when used as side stones or pave halos it can create a luminous frame that heightens the perceived vibrancy of the central kornerupine.

Provenance from Ceylon Sri Lanka is significant because the island has a long history of producing fine gem material with distinct character and quality, and kornerupine from this locality often shows the clarity and polish quality appreciated by discerning buyers. The Natural Gemstone Company stands behind the gem’s description and condition, and we emphasize that the piece is untreated, with an excellent polish applied by skilled lapidaries who align the cut to maximize chatoyancy and optical performance. For wear and care, cabochon kornerupine benefits from settings that protect the girdle and avoid direct impact to the dome, a bezel setting provides security while still allowing the cat’s eye to be viewed, and a pendant mounting can allow more freedom for the band to be seen as it responds to light. Cleaning should be done with warm soapy water and a soft brush, avoiding harsh ultrasonic treatments if you are uncertain about the presence of natural fissures, and regular professional inspections will ensure the setting remains secure. If you value a gem that combines optical drama with rarity, stable material, natural origin, and the technical skill of a cabochon cut that highlights cat’s eye, this 1.72 carat black kornerupine from Ceylon offers a compelling option, and The Natural Gemstone Company can provide further images, viewing guidance, and design consultation to help you set this stone in jewelry that will command attention and hold its appeal for years to come.