6.45 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

This listing presents a single translucent orange moonstone, weighing 6.45 carats, with precise dimensions of 11.98 x 12.06 x 6.00 mm, presented in a classic round cabochon profile, originating from Ceylon Sri Lanka, and supplied by The Natural Gemstone Company. The piece exhibits a medium intense body color, an even distribution of warm orange tones across the dome, and a translucency that allows for a soft internal glow without significant clouding. Clarity has been evaluated at eye level as very very slightly included, indicating only minute internal features that do not impede the visual field or diminish the optical phenomena. There are no treatments or enhancements recorded, and the surface finish is described as excellent polish, yielding a smooth reflective surface and clean edge transition at the girdle that is ideal for precision mounting.

From a lapidary and optical standpoint the cabochon cut has been executed to emphasize adularescence and the overall chatoyancy behavior typical of moonstone feldspar aggregates. The dome height of approximately 6.00 mm relative to a diameter near 12 mm creates a proportionally high crown that enhances the interplay between incident light and the micro lamellar intergrowths of orthoclase and albite. The lamellar structure produces a scattering layer that generates a soft sheen located below the surface, and the cutting orientation has been aligned perpendicular to the dominant lamellar planes to maximize a single broad flash when viewed on axis. The translucency grade supports light transmission sufficient to reveal internal character without allowing excessive light leakage that would wash out the body color. The refractive index range expected for gem quality orthoclase moonstone is approximately 1.518 to 1.526, with a specific gravity in the region of 2.57 to 2.62, and a Mohs hardness typically between 6 and 6.5. These material constants inform considerations for setting and wear, and they also influence how the polish responds to abrasives during final finishing.

The clarity description very very slightly included at eye level means inclusions are minor and typically comprise tiny fluid or mineral inclusions, healed fissures, or thin growth related features that are visible only under close inspection and do not form obvious eye visible blemishes or veils. Color grading as medium intense reflects a balance between saturation and lightness, producing a sunlit orange tone that reads warm but not overly dark, and the color is judged uniform across the table and pavilion areas with minimal zoning. The polish quality is excellent, indicating that the polishing sequence achieved a high luster and minimal surface distortion, with no polishing lines or pits that would interrupt the adularescent sheen. The lack of enhancement is an important provenance factor, confirming that the color and clarity are natural and inherent to the material as sourced from Sri Lanka. The combination of natural bodycolor, careful cutting orientation, and superior polish produces an appealing single flash effect that is very usable in a variety of fine jewelry applications.

For design and setting recommendations this cabochon is technically suited to bezel settings and protective mountings that shield the girdle and pavilion while allowing the dome to present its adularescent plane to the viewer. A low profile bezel will protect the stone during daily wear while retaining the dome geometry, and a closed or partially open back can be selected depending on whether the design desires slightly increased depth of color from a dark backing or prefers maximum light transmission with an open back. Given the Mohs hardness and the material cleavage tendencies of feldspar, avoidance of aggressive ultrasonic cleaning and steam treatments is advised, and cleaning should be performed with warm soapy water and a soft brush. For custom work the cabochon can be oriented to produce either a central single flash or multiple soft flashes by altering the axis relative to the mounting, and the even color and minimal inclusions make it well suited for fine rings, pendants, and bespoke paired designs where warm orange bodycolor is desired. This specimen from The Natural Gemstone Company represents a technically well executed cabochon that highlights the intrinsic optical properties of Sri Lankan moonstone, offering both collector appeal and practical usability for jewelers seeking a natural, high polish, medium intense orange moonstone with minimal internal disturbance.