1.01 Ct. Bluish Green Sapphire from Tanzania

This 1.01 carat round bluish green sapphire from Tanzania exemplifies precise lapidary control and natural character, calibrated for a collector who values technical specifics. The stone measures 5.90 by 5.71 by 3.68 millimeters, yielding a depth percentage of approximately 63.4 percent when referenced to average diameter. The cutter has executed a mixed brilliant style, combining a brilliant facet arrangement on the crown with a modified pavilion geometry to balance light performance and weight retention. This mixed brilliant approach typically employs a 57 to 58 facet count, and in this specimen the pavilion treatment directs return light in layered flashes while preserving color saturation. The table is proportioned to favor both scintillation and color display, the girdle is consistent with stable settings, and the excellent polish enhances facet junction definition, allowing crisp contrasts between dark and light facet faces.

Clarity is graded included at eye level, reflecting natural internal features visible without magnification, which are consistent with unenhanced corundum grown under variable conditions. The inclusions manifest as discrete crystal points and internal features that do not disrupt the overall transparency, they provide a reliable fingerprint of natural origin and can improve the stone value for connoisseurs who prioritize untreated material. The absence of any enhancement including heat treatment or diffusion means lattice chemistry and trace element distribution remain original, preserving pleochroic response and native color zoning. The intense color grade is notable, the bluish green hue presents with strong saturation and even distribution through the pavilion and crown, and the color depth is intentionally balanced by the cutting strategy to maximize perceptible vividness under typical lighting environments.

From a gemological durability standpoint this sapphire benefits from the inherent properties of corundum, which registers 9 on the Mohs scale of mineral hardness. This places it immediately below diamond, which is 10 on the Mohs scale, and above commonly encountered gemstones such as topaz at 8 and quartz at 7, indicating superior resistance to surface abrasion in everyday wear. Beyond simple hardness values, corundum exhibits excellent structural toughness and lacks true cleavage, factors that reduce the risk of catastrophic failure under impact when compared to minerals with prominent cleavage planes. For set jewelry applications the mixed brilliant proportions and consistent girdle lend themselves well to protective mounting styles, for example bezel and semi bezel settings for high wear pieces, while well designed prong settings can showcase the round outline and brilliant crown without compromising structural security.

The provenance of this piece further informs its character, originating from Tanzania, a source known for producing a diverse range of natural corundum hues with complex trace element signatures. The untreated state of the sapphire, combined with the cut and polish quality, aligns with the standards of The Natural Sapphire Company, assuring collectors and designers that the material is presented without alteration and with meticulous craftsmanship. For technical buyers the combination of a 1.01 carat weight, dimensions that yield an efficient depth profile, a mixed brilliant facet strategy, included clarity at eye level, intense bluish green color, excellent polish, and a Mohs hardness of 9 offers a comprehensive profile, suitable for both high end bespoke settings and secure, everyday wear configurations.