1.21 Ct. Moonstone from Madagascar

This specimen is a transparent rainbow moonstone weighing 1.21 carat, presented in a classical oval shape with exact dimensions 7.74 x 5.75 x 5.21 mm, originating from Madagascar, and offered by The Natural Gemstone Company. The cutter applied a mixed brilliant cut, combining a fully faceted brilliant crown with a tailored pavilion designed to complement the feldspathic adularescence that defines rainbow moonstone. The crown layout uses modified brilliant facets to increase internal light return and to create strong spectral flash when the stone is inclined under a light source. The pavilion is proportioned to balance scintillation and the stone depth, maintaining structural integrity of the feldspar while maximizing the interaction between incident light and the internal lamellar structures that produce the rainbow effect. The overall symmetry is precise, the table is well centered and proportional, and the excellent polish produces sharp facet junctions and uninterrupted luster across the crown and pavilion facets, factors that are particularly important in a transparent specimen where facet definition directly influences perceived brightness and the clarity of spectral flashes.

Optical character is focused on adularescence and spectral color play, with a light color intensity that allows easy reading of internal structure while sustaining an elegant, ethereal sheen. The mixed brilliant cut was chosen specifically to mediate between two competing objectives, light performance and adularescence preservation, resulting in a stone that reads both as a clean, brilliant gem at face up viewing angles and as a rainbow moonstone that reveals flashes of blue and multi spectral hues when rotated or illuminated obliquely. Clarity has been graded as slightly included at eye level, a grade that indicates small natural features are present but do not detract from the gem s overall visual appeal when set. The transparency enhances the adularescent effect, the excellent polish contributes to a lively surface reflection, and the controlled facet angles reduce light leakage. No enhancement has been applied to this stone, the optical phenomena and clarity are natural, and the Madagascar origin is consistent with the characteristic lamellar twinning and exsolution patterns typically observed in high quality specimens from that region.

Included structures within this moonstone are both diagnostic and characterful, serving as unique internal identifiers that tell the story of the crystal s growth history. Typical inclusions observed in this specimen include fine lamellar exsolution planes, microscopic platelets, and narrow tension fissures that have been partially healed during subsequent growth episodes. These features produce subtle internal striations and internal diffraction that actually contribute to the stone s rainbow sheen, by scattering light and producing discrete color flashes at particular orientations. Rather than detracting, these inclusions act as an internal fingerprint, enabling gemological mapping of the crystal and helping to corroborate provenance data, which aligns with our sourcing records from Madagascar. At eye level the stone reads as slightly included, meaning that inclusions are present but unobtrusive, they are concentrated in ways that do not interrupt the primary table face, and they become part of the gem s individual character. For setting and care, we recommend designs that protect the girdle and mounting that mitigates risk along known cleavage planes, bezel or protective prong settings are preferred, and cleaning with mild soap and water is advised while avoiding ultrasonic and steam cleaners due to the feldspar cleavage orientation. The Natural Gemstone Company stands behind full disclosure on origin and treatment, and this moonstone is presented in its natural, untreated state, an excellent choice for collectors and connoisseurs who value precise cutting, natural optical phenomena, and the documented character that inclusions bring to a genuine, ethically sourced specimen.