Natural Kyanite · 1.645 ct · Oval · Mixed Cut · Unheated · Sri Lanka

This natural Blue Kyanite weighs 1.645 carats and is fashioned in an elegant oval mixed cut, combining a classic outline with faceting designed to enhance the gemstone’s rich blue colour and transparent appearance.

Measuring approximately 8.1 × 6.0 × 3.8 mm, the gemstone presents a well-proportioned face-up size suitable for individual jewellery design. Its medium to deep blue colour gives the stone strong visual presence, while the transparent body allows light to interact effectively with the internal facet structure.

Blue Kyanite is valued for its distinctive colour, which can range from lighter blue to strongly saturated medium and deep blue tones. This specimen displays an attractive medium to deep blue body colour, giving it a refined and sophisticated appearance.

The gemstone contains natural internal inclusions and growth features, characteristics commonly encountered in natural Kyanite. These may include fine internal lines, crystalline inclusions or structural features associated with the mineral’s growth. In a transparent faceted specimen, such characteristics can remain visible while still allowing the gemstone to retain strong colour and overall visual appeal.

Kyanite is an aluminium silicate mineral with the chemical formula Al₂SiO₅ and belongs to the triclinic crystal system. One of its most distinctive gemmological characteristics is its strongly directional hardness: Kyanite exhibits significantly different hardness depending on crystallographic direction. This anisotropy requires particular care during faceting, polishing and jewellery setting.

The gemstone typically displays a vitreous to pearly luster rather than a submetallic one. Its natural optical properties, combined with strong directional colour behaviour, can produce subtle variations in blue intensity when viewed from different orientations.

This specimen is recorded as originating from Sri Lanka, an important source of gem-quality Kyanite and many other coloured gemstones.

There are no indications of heating or other treatment. The gemstone is therefore presented with its naturally observed colour and internal characteristics.

With its rich blue colour, transparent body and elegant oval mixed cut, this 1.645 ct natural Blue Kyanite is an attractive choice for collectors and jewellery designers seeking a distinctive untreated gemstone with strong colour and individual natural character.