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

This 1.85 carat cushion shape white moonstone from Ceylon presents a study in disciplined lapidary technique, dimensions 7.80 x 7.11 x 3.69 mm, cabochon cut, translucency that allows internal adularescence to develop evenly across the profile. The cabochon form is executed with a carefully moderated dome height and a crisply squared cushion outline, proportions that favor the classic moonstone sheen rather than a high domed flash that can disperse light unevenly. For technical buyers the importance of proportion cannot be overstated, because the optical phenomenon in moonstone is produced by alternating layers of orthoclase and albite, light scattering at micro lamellar interfaces. The stone exhibits near colorless body tone which optimizes the blue to white adularescence without introducing warm tones that would mute the effect, and the refractive index consistent with gem quality feldspar supports a soft, directional shimmer rather than a harsh reflection, making it ideal for pieces where controlled light play is required.

Clarity is graded slightly included at eye level, inclusions that are consistent with natural growth and with the schiller structure that defines fine moonstone specimens. These internal features are not fractures that compromise integrity, but rather lamellar interfaces and occasional pinpoint inclusions that contribute to the three dimensional quality of the adularescent banding. The polish is excellent, a level of finish that I will describe as effectively flawless on the surface, because the lapidary has removed all lap lines and left a mirror smooth skin that allows light to enter and reemerge without surface diffusion. That pristine surface finish enhances the stone from every angle, each viewing plane revealing a consistent movement of light, the adularescence appearing to travel across the crown as the viewing angle changes. The cabochon geometry, with even girdle thickness and a flat enough pavilion to allow stable setting, ensures that the shimmer is not lost in the mounting, and that the light path through the orthoclase albite layers remains intact, producing a steady, ethereal glow rather than scattered flashes.

Provenance from Ceylon, Sri Lanka, places this moonstone in a lineage of material known for fine layering and clean, near colorless body tones, characteristics that are sought after by connoisseurs. No enhancement has been applied, the stone is entirely natural, and this supports long term stability and predictability of appearance in finished jewelry. For practical application the Mohs hardness around six to six and a half requires design consideration, with protective bezels or secure claw settings recommended for everyday wear to mitigate edge chipping. Cleaning should avoid aggressive ultrasonic or steam treatments, and instead favor gentle warm water and mild detergent with a soft brush, to preserve the polished surface. The stone responds well to open backed settings when the design can accommodate it, as backing can increase apparent depth of adularescence, but closed settings highlight purity of silhouette, both approaches benefiting from the cabochon polish and cushion proportions.

At The Natural Gemstone Company we catalogue this piece as a precision cabochon that pairs scientific understanding of feldspathic layering with meticulous hand finishing, a combination that yields optical performance and practical wearability. The measured proportions 7.80 x 7.11 x 3.69 mm and weight 1.85 carat make it adaptable to a variety of design applications, from a refined solitaire to a bespoke cluster piece where the balanced adularescence can be echoed by complementary stones. The slightly included clarity should be viewed as part of the gem s natural fingerprint, contributing subtle internal texture that animates the adularescence when light interacts with the lamellar planes. When set and viewed, the excellent polish and thoughtful cabochon shaping produce a stone that appears to glow from within, delivering consistent beauty from every angle and rewarding both the technically minded buyer and the discerning jeweler who values controlled optical character along with natural provenance.