6.55 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

This listing describes a single translucent white moonstone, weight 6.55 carat, oval outline, measured 14.45 by 9.69 by 5.96 mm, origin Ceylon Sri Lanka, no enhancement. The proportions are engineered to present a classic oval cabochon silhouette, with a length to width ratio of approximately 1.49, and a domed profile that balances optimal light return with stable seat for secure mounting. The cabochon cut was selected to emphasize the stone specific optical phenomenon, with the apex of the dome aligned to present the strongest adularescence when oriented to incident light. The Natural Gemstone Company evaluates this piece as a precision cut cabochon, produced to tight dimensional tolerances that facilitate predictable behavior once set in jewelry.

The cutting and finishing reveal clear attention to facet free shaping and to polish quality, with an excellent polish grading across the dome and girdle area. The cabochon displays a smooth, evenly distributed dome curvature, with no visible cutting laps or facet junctions, and a well executed girdle transition to the base. The polish produces a pearly to vitreous surface luster depending on viewing angle, and allows internal light scattering to manifest as a soft blue white adularescence band. The cutter oriented the internal albite lamellae planes during preform stage to maximize the sheens transverse to the long axis, producing a clean, centrally located adularescence rather than diffuse flashes. The base thickness of 5.96 mm preserves structural integrity, reducing the risk of windowing while maintaining an appealing dome height for cabochon settings.

Clarity has been graded as very slightly included at eye level, based on loupe and unaided inspection under standard daylight comparable lighting. Inclusions visible in this designation are minor, predominantly submicroscopic oriented lamellar structures and fine cleavage traces that are typical for gem quality moonstone, and they do not materially interrupt the adularescent plane. The body color is described as near colorless, with a subtle cool undertone that enhances the perceived purity of the adularescent sheen. Transparency is translucent, providing uniform light diffusion through the dome and a gentle glow rather than full transparency. Because moonstone adularescence arises from light interference within the microstructure rather than surface coatings, the absence of enhancement confirmed by gemological examination means the optical effect is wholly natural. The overall result is a gem that offers an elegant balance of body color, adularescence intensity, and minimal internal character, appropriate for collectors and designers who value natural optical phenomena.

From a practical and design standpoint this 6.55 carat oval cabochon is well suited to bezel setting, low profile bezel with secure seat, or classic closed back mountings that support the base thickness and preserve the orientation of the adularescent band. The stable oval shape and moderate dome height also adapt to three stone and halo layouts where secure prong options are considered, provided care is taken to avoid excessive point loading at the girdle. With a Mohs hardness of approximately 6 to 6.5, routine wear in rings is feasible when designers account for protective settings, and recommended care includes avoiding ultrasonic cleaning, steam cleaning, and exposure to harsh acids or alkaline solutions. For long term stability, clean with warm soapy water, soft brush, and finish with a microfiber cloth. The Natural Gemstone Company stands behind the natural origin and untreated status of this moonstone, and provides full measurement, weight, and origin information to facilitate confident selection by lapidaries, jewelers, and collectors seeking a high quality Ceylon moonstone cabochon with excellent polish and natural adularescence.