2.67 Ct. White Cabochon Moonstone from Ceylon (Sri Lanka)

This 2.67 carat round white moonstone is an object lesson in proportion and optical engineering, sourced from Ceylon Sri Lanka and offered by The Natural Gemstone Company. The piece measures 8.96 x 9.04 x 5.38 mm, and its double cabochon cut is executed to exacting tolerances to balance dome height and overall profile. The term double cabochon in this instance denotes a fully domed upper table and a complementary lower dome, cut and polished to maintain radial symmetry and consistent thickness across the stone. That controlled thickness of 5.38 mm provides sufficient optical path length to produce strong adularescence while retaining pleasing wearability for rings and pendants. Clarity is graded eye clean evaluated at eye level, indicating that there are no inclusions detectable to unaided vision that would interrupt the adularescent plane. Color intensity is near colorless, which enhances the cool white to bluish sheen without introducing distracting body tints. The surface finish is an excellent polish, free from polish haze or lap marks, delivering a soft satin to high gloss transition across the domes as lighting conditions change. There has been no enhancement applied to this specimen, the material is natural and untreated.

From an optical and gemological perspective this moonstone exemplifies the interplay between cut geometry and internal microstructure. Moonstone adularescence arises from lamellar intergrowths of albite and orthoclase within the host feldspar, producing coherent scattering as light transits the alternating layers. The double cabochon profile places the primary scattering plane near the neutral axis of the gem, generating a centrally focused moonlight band that translates across the dome when the stone is tilted. Because the body is near colorless and the material is translucent rather than opaque, internal scattering yields a luminous, almost floating sheen rather than a diffuse veil. Typical refractive indices for gem quality feldspar are in the range of 1.518 to 1.526, and birefringence is low, so the apparent single band of adularescence appears clean and undistorted, rather than doubled. The cutter has prioritized symmetry and gentle curvature, avoiding abrupt changes in radius that would fragment the band, and the result is a single, well centered luminous zone with crisp edges under directional illumination. Small internal growth features that are inherent to natural moonstone are present on microscopic inspection, yet they do not impact the perceived clarity at normal viewing distances and in fact can contribute to a layered depth when examined in strong light.

In practical terms this moonstone is engineered to be a centerpiece in any fine jewelry design, and its proportions allow flexibility in settings and mounting techniques. For maximum visual effect set orientation should align the dome axis so that the adularescent band runs perpendicular to the primary viewing plane, which will provide the strongest moving band when the wearer gestures. Protective bezel settings are recommended for rings to shelter the fully rounded lower dome from impact, while a low profile prong or collet mounting can showcase the dual dome silhouette in pendants and brooches. The 2.67 carat weight coupled with the near colorless body makes the gem visually impactful without overwhelming delicate settings, and the excellent polish will read well next to both matte and high polish metalwork. Provenance from Ceylon Sri Lanka speaks to a history of skilled lapidary work and a geologic source known for clean, high adularescence material. The Natural Gemstone Company provides specimen photography and handling notes with each sale, and we advise routine care using lukewarm water and a soft brush to remove surface oils, avoiding ultrasonic cleaning and harsh chemicals to preserve the polish and natural surface integrity. This moonstone is an exceptional example of how precision cutting and thoughtful proportioning can transform natural microstructure into a focused optical spectacle, making it an ideal centerpiece for collectors and designers who value technical refinement and luminous brilliance.