2.39 Ct. Moonstone from Ceylon (Sri Lanka)

This translucent 2.39 carat radiant shape rainbow moonstone from Ceylon, Sri Lanka, presents a precise convergence of material quality and cutting expertise. The stone measures 9.55 x 6.85 x 5.73 mm, with a depth that equates to approximately 70 percent relative to the average of its length and width, a proportion chosen to balance surface presentation with internal light performance. Clarity is graded very slightly included evaluated at eye level, and the medium color intensity supports a controlled body tone that allows optical phenomena to appear without overwhelming saturation. The piece is untreated, with no enhancement, and the finish is returned with an excellent polish, giving crisp facet junctions and a finely maintained girdle that speaks to meticulous lapidary technique. At The Natural Gemstone Company we selected this individual for collectors who prioritize structural integrity of the material and fidelity of natural optical effects.

Technically the radiant cut applied to this rainbow moonstone is a hybrid faceting scheme that combines angular pavilion geometry with a brilliant oriented crown, a configuration that was adapted to maximize the particular light interactions inherent to adularescent feldspars. The crown employs a network of small, evenly sized brilliant facets to create multiple entrance windows, while the pavilion uses a mix of tapered chevron facets and truncated kite facets to redirect emergent light back through the crown planes. The result is an array of precise internal reflections that enhance both sparkle and spectral sheens. For moonstone the key optical characteristic is adularescence, a soft bluish to multicolored effulgence generated by the interference of light within micro lamellar structures, commonly alternating layers of albite and orthoclase. The radiant faceting strategy for this piece deliberately aligns facet orientations with the dominant lamellar planes observed in the rough, thereby allowing oblique incident light to travel along the layers and exit at angles that produce pronounced color flashes. The medium body color and translucent clarity facilitate this effect by permitting sufficient penetration depth for interference without introducing excessive diffusion that would dull the schiller. With the crown angles calibrated slightly shallower than those used for high refractive index gems, and with a pavilion depth focused to avoid internal trapping, the faceter has achieved an optimized balance between adularescent flash and conventional brilliance.

Craftsmanship details reinforce the functional performance of the cut, and every facet junction has been adjusted to minimize light leakage and surface scattering, supporting intense directional reflections when the stone is tilted under a point source. The excellent polish reduces micro abrasions that can scatter light and dampen the purity of adularescence, and the even girdle thickness ensures secure setting options without compromising optical symmetry. The very slightly included clarity at eye level is typical for natural rainbow moonstone and in this specimen the inclusions act at most as benign localization points for enhanced spectral play rather than detractors of overall light performance. For jewelry considerations the radiant outline, with its trimmed corners, offers both visual stability and practical resistance to chipping when set, while the elongated 9.55 by 6.85 mm profile suits a broad range of mounting styles from solitaire rings to detailed pendants where directional flash can be oriented to the wearer. Viewing recommendations for optimal appreciation include diffused daylight and point light sources at low angles to stimulate lateral interference, and rotation at slow increments to observe the layered sequence of color flashes that this radiant cut reveals. At The Natural Gemstone Company we present this 2.39 carat Ceylon rainbow moonstone as a study in how disciplined faceting, precise proportions, and conscientious surface finishing can amplify the intrinsic optical repertoire of a feldspar, offering a gemstone that is both technically refined and visually engaging for collectors and connoisseurs who value measured craftsmanship.