Natural Moonstone · 3.655 ct · Pear Cabochon · Blue Adularescence

This individually documented natural Moonstone weighs 3.655 carats and has been fashioned into an elegant pear-shaped cabochon, polished on both sides. The gemstone displays a soft milky white to almost clear body appearance accompanied by a delicate pale blue adularescence, creating a subtle floating sheen as the viewing angle and lighting change.

Measuring approximately 12.1 × 7.1 × 5.7 mm, the stone has an elongated pear outline that provides an attractive presentation of the natural feldspar material. The smooth cabochon form is particularly well suited to Moonstone because it allows the characteristic adularescent effect to move visibly across the surface rather than relying on conventional facet brilliance.

The gemstone is recorded as transparent, although its milky internal appearance produces a softer visual character in some areas. The pale blue sheen remains subtle rather than strongly saturated, giving the stone an understated optical effect that complements its natural white to near-clear body.

Adularescence is the characteristic optical phenomenon associated with Moonstone. It results from the interaction of light with extremely fine alternating feldspar layers within the gemstone. These microscopic structural layers scatter and interfere with incoming light, producing the appearance of a floating, cloud-like sheen within or just beneath the surface of the stone.

When these internal layers are sufficiently fine, shorter blue wavelengths can become particularly prominent, producing the desirable blue adularescent effect visible in this specimen. The intensity and position of the sheen change as the gemstone is tilted or viewed from different directions.

The cabochon has been polished on both sides, allowing the natural internal structure and optical effect to be appreciated from multiple viewing angles.

The overall cutting quality ranges from Fair to Good, with Fair symmetry, Fair polish and Fair to Good lustre. These finishing characteristics give the gemstone a more naturally individual presentation rather than the highly uniform appearance associated with precision commercial cutting.

Moonstone belongs to the feldspar group and has a hardness of approximately 6 on the Mohs scale. Its characteristic adularescence, combined with its layered internal structure, distinguishes it from many other transparent to translucent gemstones.

As a natural Moonstone, internal inclusions, lamellar growth structures, fine fissures, subtle colour variations and minor surface characteristics may occur. These features form part of the stone’s geological development and can also influence the distribution and visibility of its adularescent sheen.

With its elegant pear-shaped cabochon form, softly milky body and delicate pale blue adularescence, this 3.655 ct natural Moonstone offers an attractive expression of one of feldspar’s most distinctive optical phenomena. Its natural internal character and individually polished form make it suitable for collectors, bespoke jewellery or designs where the movement of the adularescent sheen can remain an important visual feature.