Natural Black Rutilated Quartz · 3.655 ct · Hexagon Mixed Cut

This individually documented Natural Black Rutilated Quartz weighs 3.655 carats and has been fashioned into a distinctive hexagonal mixed cut. The transparent Clear Quartz host contains prominent black Rutile inclusions, creating a striking contrast between the near-colourless crystal and the dark needle-like mineral structures enclosed within it.

Measuring approximately 9.8 mm across the hexagonal outline with a depth of 5.6 mm, the gemstone has a strong geometric face-up presentation. The hexagonal fantasy-style design combines the visual structure of a precision-shaped gemstone with the naturally irregular pattern of the Rutile inclusions.

A particularly attractive feature of this specimen is the presence of large and clearly visible black Rutile needles. Despite these abundant 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 frequently forms elongated, acicular or needle-like crystals and may occur in golden, reddish, silvery, brown or black appearances.

In this gemstone, the Rutile is predominantly black and forms clearly visible internal needles within the transparent Quartz. Their distribution creates an individual pattern specific to this specimen, making the inclusion architecture an important part of the gemstone’s visual and mineralogical identity.

The Quartz host has a typical refractive index of approximately 1.544–1.553, while Rutile itself has a much higher refractive index, approximately 2.62–2.90 depending on composition and measurement conditions. This strong difference in optical properties contributes to the pronounced visual contrast between the transparent host crystal and the enclosed Rutile.

The gemstone has been given a hexagonal mixed cut, allowing light to interact with both the external facet architecture and the internal inclusions. Its Good symmetry supports a balanced geometric presentation while preserving the naturally irregular Rutile pattern as the dominant internal feature.

The polished Quartz host displays a vitreous luster, while the dark Rutile inclusions may show submetallic to adamantine reflections under suitable illumination.

As a naturally included gemstone, fine fissures, internal growth structures or minor surface-reaching features may occur in association with the Rutile inclusions. These characteristics are part of the natural formation history of the specimen rather than conventional imperfections alone.

With its substantial 3.655 ct weight, distinctive hexagonal faceting, good transparency and clearly defined black Rutile inclusions, this natural gemstone offers an unusual combination of geometric cutting and natural mineral architecture. Its strong visual contrast and individual inclusion pattern make it particularly suitable for gemstone collectors, bespoke jewellery or a distinctive centre-stone design.