4.25 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

This listing describes a single translucent grey moonstone, weight 4.25 carats, oval shape, dimensions 11.12 x 8.93 x 5.95 mm, cabochon cut, origin Ceylon Sri Lanka, no enhancement. From a gemological perspective this material is a potassium aluminium silicate from the feldspar group, exhibiting adularescence generated by exsolution lamellae and microscopic layering, which scatters incident light to produce the characteristic soft sheen. The color is classified as very light grey with a very light color intensity, providing a subdued neutral field that enhances the ethereal blue white sheen without competing color saturation. Clarity has been evaluated at eye level as very slightly included, with minor internal features that do not materially impair the translucent body or the schiller effect. The polish is rated excellent, indicating a high degree of surface finish and luster, consistent with meticulous lapidary preparation and final buffing, and the overall presentation reflects careful selection and cutting to preserve optical phenomena inherent to quality moonstone.

The cabochon cutting style chosen for this stone emphasizes a domed convex profile, which in this specimen measures 5.95 mm in height relative to an 11.12 mm length and 8.93 mm width, producing a medium to slightly high dome that favors visible adularescence when oriented correctly. The oval outline has been maintained with even symmetry and a continuous girdle that integrates smoothly into the pavilion plane, facilitating secure bezel or collet seating. The cutter oriented the growth and lamellar planes to display the schiller predominantly across the crown, a technique that maximizes the perceptible glow for typical lighting angles encountered in jewelry. Surface finishing shows no significant polish lines, indicating that progressive abrasives and final polishing agents were applied to eliminate microabrasions, yielding a clean reflection of light with minimal scattering from the surface. The cabochon form preserves the stone integrity by avoiding girdle faceting, thereby reducing stress concentration along cleavage planes and enhancing wearability.

Clarity observations indicate very slight inclusions visible at normal viewing distance, these are confined and do not form clouding or significant dark spots across the field, allowing the translucent body to transmit and diffuse light effectively. In moonstone these minor inclusions are commonly fine mineral grains or tiny rupture features along cleavage planes, and they often serve to enhance the character of the adularescence by providing subtle internal scattering centers, rather than detracting from it. The very light grey body color offers a neutral backdrop that complements the sheen without overwhelming it, enabling the adularescent band to appear distinct and silky. No treatments or enhancements have been applied to this piece, ensuring natural optical properties and stable permanence under normal wear conditions. Origin from Ceylon Sri Lanka is consistent with fine quality moonstone specimens that demonstrate balanced translucency, refined hue, and attractive schiller, reflecting the established gem cutting and sourcing practices of that producing region.

For practical application in jewelry design this 4.25 carat oval cabochon is ideally suited as a center stone in a ring, pendant, or brooch where the dome can be oriented to the viewer, and where bezel setting will protect the girdle and distribute mechanical load evenly. Bezel depth should accommodate the 5.95 mm height while allowing for a slight fit clearance for thermal expansion and cleaning access. When set in silver or white metals the cool tone of the metal complements the grey body and the adularescent sheen, while warm yellow or rose gold settings provide a contrasting frame that can accentuate the stone as a focal element. Designers should orient the length of the oval parallel to the dominant axis of the schiller for maximum visual effect under everyday lighting, and should allow for a viewing window when designing closed back settings to preserve transmission and internal light diffusion. Care instructions include avoidance of ultrasonic cleaners and harsh chemical exposure, gentle cleaning with warm water and mild detergent, and routine inspection of the setting to safeguard against impact along cleavage orientations. This moonstone is presented by The Natural Gemstone Company, and it represents a thoughtful selection for connoisseurs who appreciate technical quality in cut, clarity, color, and provenance, offering a naturally luminous piece that integrates traditional lapidary craftsmanship with reliable gemological attributes.