Natural Moonstone · 15.003 ct · Pear · Custom Cut

This individually documented natural Moonstone weighs an impressive 15.003 carats and has been fashioned into a distinctive pear-shaped combination cut, featuring a mixed-cut upper section and an individually designed custom-cut lower section. The gemstone displays a clear to very slightly white body appearance with an attractive slight blue adularescence, combining high transparency with the characteristic optical behaviour of natural Moonstone.

Measuring approximately 16.8 × 16.5 × 11.1 mm, this is a substantial gemstone with exceptional visual presence. Its generous proportions provide sufficient depth for the custom pavilion design while maintaining a broad face-up presentation.

The gemstone is transparent and has a source clarity assessment comparable to VS2, corresponding to the NGB VS clarity profile. Only relatively limited natural internal characteristics are present, allowing light to travel effectively through the stone and supporting a notably clean appearance for a faceted Moonstone of this size.

A defining feature of this specimen is its slight blue adularescence. This characteristic feldspar phenomenon appears as a soft bluish floating sheen that changes position and intensity as the gemstone is moved under different lighting conditions and viewing angles.

Adularescence results from the interaction of light with extremely fine internal feldspar structures. These microscopic layers scatter and interfere with incoming light, producing the characteristic blue-to-white sheen associated with Moonstone. The combination of good transparency and visible adularescence is particularly attractive in faceted material, where both conventional facet reflections and the softer internal optical effect can contribute to the stone’s appearance.

The cutting quality of this specimen is assessed as Very Good, with Very Good to Excellent symmetry providing a highly balanced pear-shaped presentation. Very Good polish and Very Good luster further support crisp surface reflections, attractive light return and a refined overall finish.

The upper mixed-cut arrangement provides conventional facet interaction, while the custom lower section adds depth and individuality to the optical presentation. Together, these cutting elements create a gemstone that differs distinctly from standardized commercial Moonstone cuts.

No indications of heating or other treatment have been recorded for this specimen. It is therefore presented in its naturally documented state, with its transparency, internal structure and blue adularescent effect preserved as recorded.

Moonstone belongs to the feldspar group and has a hardness of approximately 6 on the Mohs scale. Transparent Moonstone suitable for high-quality faceting requires material with sufficient clarity and structural integrity to support a precision cut while retaining its characteristic optical effect.

As a natural gemstone, fine lamellar growth structures, minute inclusions, subtle internal variations or minor surface-reaching characteristics may still occur. These features form part of the geological history and individual identity of the material.

With its exceptional 15.003 ct weight, high transparency, refined pear-shaped faceting and visible blue adularescence, this natural Moonstone represents a particularly strong combination of size, clarity, cutting quality and feldspar optical character. Its very good overall finish and individual custom pavilion design make it especially suitable for collectors, bespoke jewellery or a distinctive centre-stone application.