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

This listing presents one beautiful opaque white moonstone, round shape, weighing 1.68 carats with precise dimensions of 7.78 by 7.68 by 4.10 millimeters. The gem is cut as a cabochon to maximize its optical effect, and it shows a near colorless body with an excellent polish that delivers a clean, silky surface feel. Clarity has been evaluated at eye level as very very slightly included, a grade that indicates only the most minor internal features visible under close inspection and none that detract from the overall appearance when set in jewelry. There are no enhancements applied to this stone, and its documented origin is Ceylon, Sri Lanka, a provenance known for producing moonstones with appealing adularescence. The Natural Gemstone Company presents this example as a naturally attractive, ready-to-set cabochon ideal for buyers who favor classic, luminous gemstones with verifiable origin and treatment history.

The optical character that makes this moonstone special is adularescence, the soft, floating sheen that appears to glide across the surface when the stone or the light source moves. Unlike the high-velocity sparkle of a well-cut diamond or the strong scintillation of a faceted sapphire, adularescence is a diffuse, internal glow produced by submicroscopic layering in the orthoclase feldspar structure. This layering scatters light in a way that produces a lunar, almost ethereal band of light rather than pinpoint flashes. Compared with opal, which displays play-of-color from diffraction of light across silica spheres, moonstone’s adularescence is monochromatic and directional, often appearing as a blue or white sheen across a near colorless body. The cabochon cut selected for this 1.68 carat round enhances that phenomenon, allowing the sheen to form a continuous, visible band across the dome while minimizing surface reflections that would otherwise dilute the effect. For collectors and designers who understand the differences in optical physics between gems, a moonstone like this offers a complementary aesthetic to more brilliant stones, pairing well in mixed settings where a soft, luminous counterpoint is desired.

From a grading and value standpoint, the attributes of this piece are noteworthy to an educated buyer. The very very slightly included clarity grade evaluated at eye level means any inclusions present are minimal, typically limited to fine needles or thin growth lines inherent to feldspar, and they do not interrupt the adularescent band. Many moonstones display surface-reaching fissures or heavy internal veiling that scatter light and reduce the clarity of the sheen. In this specimen the excellent polish and the rounded, symmetrical profile preserve a clean presentation of the adularescence and make the stone appear larger and more luminous than its carat weight alone might suggest. The near colorless body color is particularly valuable because it serves as a neutral canvas for the adularescence, producing a crisp, bright band rather than a muted or muddied effect. Origin from Ceylon, Sri Lanka adds provenance value, as Sri Lankan moonstones are historically prized for their clarity and pure adularescence. The lack of enhancement or dye further enhances market confidence, because natural, untreated moonstones with this combination of size, clarity, and polish are less commonly encountered than lower quality or treated material.

Practical considerations for the buyer and jeweler are equally important for assessing value and suitability. Moonstone has a Mohs hardness of roughly 6.0 to 6.5 and a perfect cleavage along certain crystallographic planes, which means it requires careful handling during manufacture and everyday wear. The cabochon form and modest dome height of 4.10 millimeters make this stone well suited to bezel settings, protective closed-back mounts, or pendants and earrings where impact risk is lower. Ring settings are possible but should be designed with protective shoulders or bezels to minimize edge chipping and to keep the surface from abrasive contact. Cleaning should be done with warm water, mild detergent, and a soft brush, avoiding harsh chemical cleaners and ultrasonic or steam treatments. For buyers who prioritize both beauty and long-term durability, the combination of an untreated Sri Lankan origin, excellent polish, minimal eye-visible inclusions, and a well-executed cabochon cut makes this moonstone an attractive option for bespoke pieces and careful everyday wear. The Natural Gemstone Company stands behind the natural origin and the no-enhancement status of this gem, and we are available to provide additional imagery or mounting recommendations to help you realize its optimal use in finished jewelry.