3.39 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

This specimen is a transparent 3.39 carat oval white moonstone, measuring 13.51 by 9.74 by 3.35 mm, cut as a cabochon to maximize its adularescent properties. The body color is classified as colorless in intensity, with clarity graded as very slightly included, evaluated at eye level, and the surface shows an excellent polish. Origin is Ceylon Sri Lanka, and there has been no enhancement applied to the material. From a gemological perspective this moonstone displays the expected physical parameters for gem quality orthoclase and albite feldspar, with a refractive index in the region of 1.518 to 1.526, a specific gravity near 2.56 to 2.58, and a Mohs hardness of approximately 6 to 6.5, characteristics that inform both cutting strategy and setting choices for long term wear.

The cabochon cut has been executed with technical precision, the dome profile and symmetry engineered to present a continuous floating band of light across the crown. The dome height of 3.35 mm is balanced to create a broad play of light without compromising stability in common mounting styles. Cutters have oriented the lamellar structure so that the adularescence moves parallel to the long axis of the oval, producing a clean centralized sheen that reads as a vibrant internal glow rather than a diffuse fog. The polish quality is exceptional, the surface free from lapping marks and presenting a mirror like finish that sharpens the contrast between the transparent body and the internal schiller. Inclusions are minimal and well positioned, they remain subtle under normal viewing conditions and do not disrupt the continuity of the sheen, which is critical for jewelry that relies on optical motion to communicate vitality.

Optically this moonstone achieves a vibrant presence through the interplay of its transparent body and the adularescent effect, the combination producing a compelling contrast that makes the gem stand out in any setting. When light strikes the stone the lamellar intergrowths scatter and refract light to produce a floating band of white to silvery light that can show faint blue tinges depending on viewing angle and illumination, a lively characteristic that reads as color in motion. The neutral colorless body allows the sheen to assert itself as the primary visual element, which means this gem will perform exceptionally as a solitary focal stone in a ring or pendant or as the center of a mixed media composition paired with small brilliants. For designers and connoisseurs who specify gemstones by optical effect, this cabochon offers predictable behavior, delivering a strong centralized adularescence even under lower ambient lighting, which ensures the piece remains visually active during everyday wear.

Practical considerations for setting and care complement the optical advantages, and The Natural Gemstone Company recommends settings that protect the girdle and crown while allowing light to interact with the dome. A low bezel with a thin top edge will secure the stone for frequent wear, while minimal prong work oriented to the long axis will maximize the visible sheen. Metal choice influences perceived vibrancy, with yellow gold introducing a warmer context that can make the adularescence appear creamier, and white metals accentuating the cool, silvery character of the sheen. Given the Mohs hardness near 6 to 6.5, avoid exposure to harsh abrasives and consider a protective mount for rings intended for heavy daily use. Cleaning with mild detergent and warm water, followed by soft cloth drying, will preserve polish and optical clarity, and ultrasonic and steam cleaners are not recommended for routine maintenance. This naturally sourced, unenhanced cabochon from Ceylon Sri Lanka is offered with full disclosure through The Natural Gemstone Company, and we can provide additional images taken under varied angles of light, guidance on exact mounting dimensions, and advice on complementary stones and metal pairings to ensure the finished jewelry piece highlights the gem in the most technically effective way.