0.79 Ct. Greenish Blue Cabochon Sapphire from Montana

This piece is a transparent 0.79 carat round shape sapphire, presented as a cabochon, with measured dimensions of 5.26 x 5.28 x 2.61 mm. The color is a greenish blue at a medium light intensity, distributed fairly evenly across the dome, producing a soft cool hue that is characteristic of Montana origin material. The cabochon cut emphasizes a smooth, continuous dome rather than faceted planes, and this example displays an expertly executed convex profile with an even curvature and an excellent polish that yields strong specular reflections on the dome surface. The gem was heat treated, a stable and standard enhancement in the trade, applied to refine body tone and to reduce certain inclusional effects while preserving the natural character and origin signature of Montana sapphires.

Clarity is graded included as evaluated at eye level, and inclusions are observable without magnification, contributing to the gems natural identity and visual texture. These internal features are distributed within the crystal and do not interrupt the overall transparency, they create subtle variegation beneath the dome that can appear as soft veiling or pinpoint crystals when viewed in different lighting. From an optical perspective the cabochon presents good light transmission for a medium light material, with the dome geometry allowing light to travel through and reflect within the stone to produce internal scintillation and a gentle play of tone. Heat treatment has improved the uniformity of color and minimized some of the more opaque patches, while the excellent polish minimizes surface scattering, so the face up appearance remains lively rather than dull.

From a lapidary and setting perspective, this sapphire demonstrates careful cutting proportions and attention to symmetry, the dome height of 2.61 mm on a diameter near 5.27 mm gives a higher than average dome, approximately half the diameter, which enhances the stone s presence and protects the internal features, making it a strong candidate for bezel or flush settings that cradle the base while exposing the domed table for visual impact. The transition from the dome to the girdle area is smooth and well centered, indicating controlled material removal and skilled hand finishing, and the base is sufficiently flat to sit securely in typical mounting styles. For design and durability considerations avoid thin prong claws that might expose the edge of the dome to impact, instead specify settings that support the perimeter and secure the stone without aggressive pressure on the dome. The Natural Sapphire Company offers this Montana origin sapphire with full disclosure of its heat treatment and included clarity, and our team can provide additional imaging under varied lighting, setting mockups, and guidance on care, recommending routine cleaning with warm soapy water and avoidance of harsh chemicals or ultrasonic cleaning if inclusions are extensive.