1.49 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

This listing describes a single translucent blue flash moonstone, weight 1.49 carats, in a pear shape with dimensions 8.70 x 6.04 x 3.93 mm. The gem is fashioned as a cabochon, which is the traditional cut for this mineral to maximize its optical phenomenon. Clarity is graded as very very slightly included evaluated at eye level, indicating minimal internal features that do not detract from the stone when viewed unaided. The color intensity is described as light, providing a delicate base that allows the characteristic blue sheen to stand out. The surface finish is an excellent polish, providing smooth reflective planes that enhance surface luster and the clean reveal of optical effects. There are no enhancements recorded, confirming the stone is presented in its natural state, and provenance is Ceylon Sri Lanka. For reference and classification, the opal type is White Opal, included here for comparative context within iridescent and adularescent gems. The Natural Gemstone Company presents this stone with full description and origin information to support informed selection by designers and collectors.

Optically the gem exhibits a pronounced blue flash that travels across the dome of the cabochon as the angle of incidence changes, a phenomenon commonly referred to as adularescence in moonstones. The effect arises from submicroscopic lamellar intergrowths within the feldspar structure, which scatter light to produce a silky and often bluish sheen. In this specimen the translucency allows light to penetrate and interact with internal layering, yielding a floating or lunar appearance rather than surface glitter. The excellent polish contributes to a smooth, uninterrupted surface which permits the adularescence to read cleanly, while the very very slight inclusions remain subdued and do not interrupt the flow of light. The pear shape concentrates the flash toward the apex and broadens it across the belly of the gem, which is a useful consideration for setting so that the primary flash can be displayed to best effect. The light body color is advantageous in a blue flash moonstone as it provides contrast, making the blue sheen appear more vivid against the pale background.

When measured against other gemstones that produce similar visual phenomena, this moonstone occupies a distinct position. Compared with common white opal, which displays play of color through diffraction from silica spheres, the moonstone produces a softer, more directional sheen, rather than the multi spectral flashes typical of opal. White Opal can show sharp, multicolored flashes when oriented correctly, but moonstone provides a more monolithic blue or white glow that appears to hover within the stone. Compared with labradorite, another feldspar family member known for labradorescence, the labradorite effect often manifests as bold, metallic patches of green, blue or gold that can be more iridescent and higher contrast than moonstone. Labradorite generally produces a broader range of color and sometimes stronger intensity due to different internal layering scales, while a blue flash moonstone tends to be subtler and more ethereal. In comparison with chatoyant stones such as chrysoberyl with a cat eye effect, moonstone’s adularescence is diffuse and plane dependent, whereas cat eye phenomena are sharp, linear bands that react predictably to light with a single concentrated eye. In terms of brilliance and reflectivity, transparent faceted gemstones like sapphire and topaz return direct, mirror like reflection and refractive brilliance, which is a different optical regime entirely from the internal scattering that defines moonstone. This specimen, with its light body color and excellent polish, emphasizes translucency and inner glow rather than surface sparkle or spectral play.

Practical considerations for use and care follow from these optical and material characteristics. The cabochon form is optimal for settings that aim to showcase the adularescence, such as bezel or low prong mounts that protect the dome while keeping the surface visible. The pear shape suits pendant and ring designs where directional orientation can be used to advantage, aligning the broad face to catch light in active wear. Given the natural state and lack of enhancements, standard care for softer feldspar minerals applies, including avoiding harsh knocks and prolonged exposure to heat or chemicals. Routine cleaning with mild soap and lukewarm water and a soft brush is effective, followed by gentle drying. The Natural Gemstone Company certifies the origin and enhancement status as provided, and recommends that jewelers and designers consider the stone’s translucency and flash when selecting mounting metal and setting style, as reflective backs or colored settings can alter the perceived intensity of the blue sheen. For collectors seeking a natural example of adularescent material from Ceylon Sri Lanka, this 1.49 carat pear shaped cabochon offers a clear, well polished presentation that demonstrates the characteristic lunar glow of high quality blue flash moonstone.