1.76 Ct. Moonstone from Madagascar

This transparent 1.76 carat oval shape rainbow moonstone measures 8.58 by 6.45 by 5.51 mm, and is presented with a mixed brilliant cut that balances table transparency with pavilion faceting to enliven internal light movement. The stone displays a light color intensity and an excellent polish, with a clarity grade of slightly included when evaluated at eye level. No enhancement has been applied to this gem, and its recorded origin is Madagascar. The combination of weight, proportions, and finish yields a gem that reads as both delicate and resolute, the oval outline providing classical symmetry while the mixed brilliant faceting translates the material s internal sheen into lively, directional luminosity.

The tale of this moonstone begins deep in geological time, within the cooling roots of ancient continental crust where alkali feldspar minerals crystallized from silica rich melts. Over millions of years these feldspars grew as large, well formed crystals in slowly cooling pegmatitic and hydrothermal environments, allowing internal structures to develop with remarkable regularity. Subsequent episodes of metamorphism and tectonic deformation induced exsolution and lamellar twinning at microscopic scales, producing alternating layers of different feldspar compositions. It is the interaction of light with these parallel lamellae that produces the characteristic adularescence and spectral flashes commonly described as a rainbow effect in certain moonstones. Tectonic uplift and erosion then exposed the host rocks, and the noble fragments were eventually released, transported, and concentrated within secondary deposits in Madagascar, where they were discovered and recovered from hard working earth.

When this particular rough was examined by our lapidaries, its combination of transparency and internal layering suggested a cutting approach that would preserve adularescence while maximizing clarity and brilliance. The mixed brilliant cut chosen for this gem retains a generous table to showcase transparency and the adularescent sheen, while employing a well proportioned crown and pavilion to produce scintillation and light return. The cutting process respected the stone s natural axes, aligning facets to the plane of internal lamellae so that the rainbow flashes appear with clarity and direction. Slight inclusions visible at eye level are natural features of feldspar crystallization and provide a record of the stone s growth history, they do not detract from the overall appearance given the gem s high polish and well executed faceting.

This moonstone is offered in its natural state, free from heating, coating, dyeing, or other enhancements, and its provenance in Madagascar is documented. The stone s dimensions and weight are retained with precise cutting, and the excellent polish produces a smooth, reflective surface that accentuates both transparency and internal sheen. The Natural Gemstone Company acknowledges the geological history inherent in each piece we handle, and provides this description to convey both the measurable specifications and the deeper narrative of formation. For specialists and thoughtful collectors, this gem represents a clear example of feldspar crystallization and optical phenomena rendered into a wearable, enduring form.