0.85 Ct. Blue Flash Moonstone from Ceylon (Sri Lanka)

This listing describes a transparent 0.85 carat pear shape blue flash moonstone originating from Ceylon Sri Lanka, offered by The Natural Gemstone Company. The gem measures 6.71 by 5.25 by 4.68 mm, presented in a classic pear outline that balances a tapered point with a broad girdle. The material is notable for its transparency and for the distinct blue adularescence that appears when the stone is oriented to light, the effect produced by light scattering from thin, microscopic lamellar intergrowths within the orthoclase and albite structure. Clarity has been evaluated as slightly included at eye level, these inclusions are internal growth features that sit below the table and do not disrupt the primary blue flash, they are consistent with natural formation processes and contribute to identification. Color intensity is light overall, the body color remains near colorless to faintly milky which serves to enhance the perceived purity of the blue sheen, the surface finish has been given an excellent polish which maximizes light return and tactile smoothness, and the stone has received no enhancement of any kind.

The cut is a controlled mixed brilliant cut designed specifically to optimize adularescence in a pear geometry, the cutter has combined a brilliant facet arrangement on the pavilion with complementary step influenced facets on the crown, this hybrid approach concentrates reflected light toward the table and along the length of the pear, producing a focused blue flash that travels when the stone is tilted. Pavilion facet angles have been selected to favor internal light transmission across the lamellar planes rather than excessive light leakage, the table has been sized to balance flash visibility with overall scintillation, and the crown facets have been executed to allow soft diffusion of the adularescent band while maintaining crisp facet junctions. Attention to symmetry and girdle thickness is evident, the girdle presents a uniform profile that facilitates secure setting without overcutting, the culet is minimal to preserve pavilion integrity and to avoid introducing a disruptive dark spot under the table. The polish quality is excellent, the facet surfaces read clean under magnification and they produce minimal surface light scattering, this level of craftsmanship in a 0.85 carat example is uncommon, because achieving a transparent body and a strong blue flash simultaneously requires precise orientation and removal of material only where it enhances optical return.

From a rarity perspective this moonstone occupies a distinctive niche among gem collectors and designers, large moonstones with transparent clarity and vivid blue adularescence are comparatively scarce, many moonstones that display strong blue flash tend to be either more translucent or appear only at smaller sizes where orientation and lamellar continuity are easier to preserve. In this context a pear shaped 0.85 carat specimen that combines transparency, a focused blue flash, and a high quality mixed brilliant cut is notable, the light body color enhances the perceived purity of the blue sheen, and the minimal inclusions evaluated at eye level mean that the stone reads clean to the viewer while retaining natural character. For practical design considerations the dimensions and pear outline make the stone suitable for solitaires and halo compositions, setting recommendations include open back or low bezel environments that allow light to enter the pavilion and support movement for the adularescent band, metals such as platinum or cool white gold will complement the blue flash and preserve color balance, designers seeking a refined but uncommon moonstone will appreciate that this gem has not been treated, it is natural from Ceylon Sri Lanka and ready for mounting. The Natural Gemstone Company stands behind the description provided, this piece is presented with professional measurements and accurate grading terminology to assist gemologists and knowledgeable buyers in assessing its technical and aesthetic value.