1.57 Ct. Bi Color / Parti Sapphire from Tanzania

This transparent cushion shape parti sapphire weighs 1.57 carat and measures 7.84 x 5.37 x 3.89 mm, expertly faceted by The Natural Sapphire Company to maximize optical performance and color distribution. The cutting style is a mixed brilliant configuration, utilizing a brilliant-cut crown to enhance scintillation and a modified step or pavilion structure to deepen color saturation and control light return. Facet junctions are precise, and the excellent polish yields crisp facet planes and strong mirror contrast, which is particularly important for parti sapphires where color zones must be presented cleanly. The stone is eye clean at standard viewing distance, indicating the absence of any inclusions visible to the unaided eye while retaining typical microscopic characteristics of natural corundum, such as fine silk or minor healed fissures that do not affect durability or visual clarity. No enhancement has been applied, preserving the natural zoning and intense color intensity that characterize this Tanzanian origin material.

On the Mohs scale of mineral hardness, this sapphire registers as corundum at nine, offering exceptional resistance to abrasion and surface wear compared to common jewelry minerals such as quartz at seven and topaz at eight, while remaining second only to diamond at ten in hardness. This high hardness, combined with the gemological fact that corundum has no true cleavage, makes the gem well suited for everyday wear when properly set, though it remains prudent to avoid sharp lateral impacts that can produce chips at facet junctions. For secure mounting and to protect the pavilion and girdle, bezel or well-engineered prong settings are recommended to preserve the integrity of the cushion outline and mixed brilliant geometry. The stone’s bi-color character and intense saturation respond well to controlled light environments and precision settings that allow both the green and blue facets to display without one hue dominating, making this piece a technically refined choice for connoisseurs who value craftsmanship, natural origin, and the durable performance inherent to a high quality Tanzanian sapphire from The Natural Sapphire Company.