Natural Black Rutilated Quartz · 3.720 ct · Hexagon Mixed Cut

This individually documented Natural Black Rutilated Quartz weighs 3.720 carats and has been fashioned into a distinctive hexagonal mixed cut. Its transparent Clear Quartz host contains prominent black Rutile inclusions, creating a dramatic natural contrast between the near-colourless Quartz and the dark needle-like mineral structures enclosed within it.

Measuring approximately 9.8 × 9.8 × 9.8 mm across the hexagonal outline with a depth of 5.7 mm, the gemstone presents a strong and well-balanced geometric face-up appearance. The fantasy-style hexagonal faceting combines structured cutting with the naturally irregular Rutile pattern, giving the stone a highly individual visual identity.

A defining characteristic of this specimen is the presence of large, clearly visible black Rutile needles. These acicular inclusions form a bold internal pattern throughout the transparent Quartz and provide the gemstone with its distinctive mineralogical character.

Despite the abundance of Rutile inclusions, the Quartz host retains good transparency and lively light interaction. The mixed facet arrangement creates surface and internal reflections that complement the darker Rutile structures rather than allowing the inclusions to dominate the entire optical presentation.

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 large needle-like structures distributed through the transparent Quartz. Their orientation and density create a naturally graphic pattern unique to this individual gemstone.

The polished Quartz host displays a characteristic vitreous luster, while the enclosed Rutile may show darker submetallic to adamantine reflections under suitable illumination. The reported submetallic appearance therefore relates primarily to the Rutile inclusions rather than to the polished Quartz surface itself.

The gemstone shows Very Good symmetry, supporting a balanced and well-resolved hexagonal outline. This precise geometric presentation contrasts effectively with the naturally irregular internal Rutile structures, creating a strong combination of lapidary design and mineralogical individuality.

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

As a naturally included gemstone, fine internal fissures, growth features and minor surface-reaching characteristics may occur around or alongside the Rutile needles. These features form part of the stone’s natural development and contribute to its individual internal architecture.

With its 3.720 ct weight, very good symmetry, transparent Quartz host and dramatic network of large black Rutile inclusions, this natural gemstone offers a striking balance between precise geometric cutting and naturally formed mineral architecture. Its individual internal pattern makes it especially attractive for collectors, bespoke jewellery or a distinctive centre-stone design.