Natural Black Rutilated Quartz · 3.915 ct · Hexagon Mixed Cut

This individually documented Natural Black Rutilated Quartz weighs 3.915 carats and has been fashioned into a distinctive hexagonal mixed cut. Its transparent Clear Quartz host contains prominent black Rutile inclusions, creating a striking natural contrast between the near-colourless Quartz and the dark needle-like mineral structures enclosed within it.

Measuring approximately 9.8 × 9.9 × 9.9 mm across the hexagonal outline with a depth of 6.2 mm, the gemstone presents a substantial geometric face-up appearance. The hexagonal fantasy-style design combines structured faceting with the naturally irregular Rutile pattern, giving the stone an individual visual identity.

A particularly attractive characteristic of this specimen is the presence of large and clearly visible black Rutile needles. Despite the abundance of inclusions, the Quartz host retains good transparency, allowing the internal mineral structures to remain clearly observable from different viewing angles.

Natural Black Rutile Inclusions

Rutilated Quartz consists of natural Quartz containing crystals of Rutile, a titanium dioxide mineral (TiO₂). Rutile commonly develops as elongated prismatic or acicular crystals and may occur in golden, reddish, silvery, brown or black forms.

In this specimen, the Rutile appears predominantly black, forming clearly defined needle-like structures throughout the transparent Quartz. Their orientation, density and distribution create a naturally graphic internal pattern that is unique to this individual gemstone.

The mixed faceting allows light to interact with both the external facet architecture and the internal Rutile structures. Under changing illumination, the black needles may produce subtle reflective or submetallic highlights while remaining strongly contrasted against the clear Quartz host.

The gemstone shows Good symmetry, supporting a balanced hexagonal presentation while allowing the naturally irregular Rutile pattern to remain the dominant internal feature.

The polished Quartz host itself displays the characteristic vitreous luster of crystalline Quartz, while the enclosed Rutile may display submetallic to adamantine reflections. The reported submetallic appearance therefore relates primarily to the Rutile inclusions rather than the polished Quartz surface.

Black Rutilated Quartz is commonly heated to help stabilise included material. Unless treatment has been specifically confirmed for this individual gemstone, this should be regarded as a general treatment practice rather than definitive evidence that this particular specimen has been heated.

As a naturally included gemstone, internal growth features, fine fissures and minor surface-reaching characteristics may occur, particularly around or alongside the Rutile needles. These features form part of the natural mineralogical character of the specimen and contribute to its individual appearance.

With its 3.915 ct weight, good transparency, distinctive hexagonal faceting and prominent black Rutile inclusions, this natural gemstone offers a striking combination of geometric cutting and natural mineral architecture. Its unique internal pattern makes it particularly attractive for gemstone collectors, bespoke jewellery or an individual centre-stone design.