Natural Spinel · 1.31 ct · Pear · Purplish Blue · Unheated

This individually documented natural Spinel weighs 1.31 ct and is fashioned in an elegant pear-shaped mixed cut, measuring approximately 9.3 × 6.5 × 2.8 mm. The gemstone displays an attractive purplish-blue body colour, combining a predominantly blue appearance with a distinct purple secondary influence that gives the stone additional depth and individuality.

Natural Spinel is a magnesium aluminium oxide valued for its brilliance, vitreous luster, durability and broad natural colour range. Blue and purplish-blue Spinel can result from trace-element chemistry within the crystal structure, although the exact colour-causing elements of an individual gemstone require analytical confirmation.

This specimen is transparent and displays an included clarity profile classified as I. Natural inclusions and internal structural features are clearly present within the gemstone and reduce its internal cleanliness, but sufficient transparency remains for the purplish-blue colour and internal facet reflections to remain visually evident.

The pear-shaped mixed cut combines different facet arrangements to balance colour retention, brilliance and the elongated outline of the stone. Its 9.3 mm length provides good visual presence for a 1.31 ct gemstone, while the vitreous luster contributes additional surface brightness.

Spinel belongs to the cubic or isometric crystal system and is isotropic, showing no birefringence. Typical gem-quality Spinel has a refractive index of approximately 1.712–1.736, a specific gravity of approximately 3.58–3.61, dispersion of approximately 0.020 and a hardness of 8 on the Mohs scale. This combination of hardness and absence of cleavage makes Spinel a durable gemstone suitable for jewellery use.

This specimen is documented as unheated and untreated, preserving its natural colour and individual internal characteristics.

The combination of attractive purplish-blue colour, transparent material, elegant pear shape and natural untreated character gives this 1.31 ct Spinel an appealing individual presentation, while its included clarity remains the principal factor limiting the overall quality grade.