Natural Moonstone · 4.099 ct · Oval Cabochon · Light Blue And Blue Adularescence

This natural Moonstone weighs 4.099 carats and has been fashioned into a polished oval cabochon, with both sides finished to reveal the gemstone’s internal structure and optical character.

Measuring approximately 10.2 × 7.1 × 6.4 mm, the stone displays a milky white to locally clearer body appearance accompanied by attractive light blue to vivid blue adularescence. As the gemstone is moved beneath the light, the blue sheen shifts across the cabochon and appears to float beneath the surface, creating the characteristic optical effect for which Moonstone is valued.

The relatively deep cabochon profile provides sufficient body to display the internal feldspar structures from different viewing angles. Fine lamellar growth features, cloudy internal zones, natural veils and fissure-related characteristics are visible within the gemstone and contribute to the individual distribution of the adularescent effect. These features are part of the natural formation of the material rather than surface decoration or artificial enhancement.

The photographs show particularly attractive areas of concentrated blue adularescence, ranging from a softer pale blue sheen to stronger electric-blue flashes depending on the angle of illumination. In other orientations, the gemstone returns to a softer milky white or semi-transparent appearance, demonstrating the directional nature of the phenomenon.

Adularescence results from the interaction of light with extremely fine internal feldspar layers. Light is scattered and interferes within these microscopic structures, producing the characteristic floating blue sheen rather than the facet brilliance associated with transparent cut gemstones. The smooth cabochon form is therefore especially appropriate for presenting this natural optical phenomenon.

No indications of heating or other treatment have been recorded for this gemstone. The stone is presented in its naturally documented state and is the exact natural Moonstone shown in the product photographs.

With its 4.099 ct weight, substantial cabochon depth, natural internal character and clearly visible light blue to blue adularescence, this Moonstone offers an individual expression of one of feldspar’s most distinctive optical phenomena. It is suitable for gemstone collecting, bespoke jewellery or settings designed to keep the moving blue sheen central to the finished piece.