6.07 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

This item from The Natural Gemstone Company is a single translucent brown moonstone, cabochon cut, weighing 6.07 carats, dimensions 13.41 by 11.11 by 6.02 millimeters, origin Ceylon Sri Lanka, no enhancement. The oval outline is slightly elongated with a length to width ratio of approximately 1.21, providing classical proportions for a high dome cabochon. The clarity is graded very very slightly included, evaluated at eye level, which indicates that inclusions are extremely minor for unaided vision and do not compromise overall transparency or the integrity of the stone. Color intensity is medium intense, yielding a warm brown body tone that remains even across the table and shoulders, and the polish is excellent, delivering a smooth, near mirror surface that supports consistent light reflection and adularescence. Carat weight converts to approximately 1.21 grams, which combined with the given dimensions results in a substantial presence suitable for statement rings or pendants.

Optical behavior is central to the gemological value of this specimen. Moonstone adularescence arises from the lamellar intergrowth of albite and orthoclase feldspars, producing coherent interference of light that manifests as a soft sheen. In this brown variety the sheen appears as a pale silvery to slightly warm schiller, best observed in directional or raking light and when the dome is tilted relative to the light source. The translucent body allows partial internal transmission while still offering surface reflection, creating a depth effect that emphasizes the layered structure. The cutter oriented the internal lamellae to optimize this optical sheen across the central table, maintaining a balanced interplay between body color and adularescence. Under typical viewing conditions the sheen remains centered and mobile, indicating consistent micro lamellar spacing and a lack of disruptive cleavage planes intersecting the visual axis.

From a lapidary perspective, the cabochon execution reflects considered decisions in dome height and symmetry. The 6.02 millimeter height produces a relatively high dome in relation to mean lateral dimension, approximately fifty percent of average width, which enhances the mobility of adularescence and provides a sculpted silhouette when mounted. Edges are smoothly blended into the base to facilitate bezel or collet settings, while the base was left sufficiently flattened to ensure secure seating in closed back mounts. Faceting is absent by design, as the cabochon style is essential to display adularescence rather than faceted brilliance. The very very slight inclusions present were taken into account during preforming, positioned off axis when possible to avoid focal disruption of the sheen. The excellent polish was achieved through progressive fine lapping and final cheme polishing to remove minute surface scratches that could otherwise scatter light and mute the moonstone effect.

Technical data relevant to specialist buyers are provided to support informed decision making. Typical refractive index values for moonstone are in the range of 1.518 to 1.526, and specific gravity commonly lies between 2.56 and 2.59, consistent with orthoclase dominant feldspar. Mohs hardness is approximately six to six point five, which necessitates careful setting design and routine wear considerations to minimize abrasion and impact. Feldspar cleavage can produce planar weaknesses, therefore protective settings such as bezels or low profile collets are recommended for daily wear, and cleaning should be performed with mild soapy water and a soft brush, avoiding ultrasonic cleaners and harsh chemicals. This Ceylon origin moonstone is offered without enhancement, and The Natural Gemstone Company provides provenance and condition documentation upon request to support professional appraisal and bespoke jewelry design projects. For buyers seeking a well proportioned, technically meticulous cabochon that emphasizes adularescent character, this brown moonstone presents a refined combination of translucency, stable body color, and lapidary craftsmanship.