9.90 Ct. Blue Tanzanite from Tanzania

This transparent 9.90 carat blue tanzanite from Tanzania presents as an oval measuring 15.22 x 11.86 x 7.98 mm, a size and shape that sit squarely in the premium bracket for custom jewelry design. The cutting style is faceted, executed in a mixed brilliant cut that combines a brilliant facet arrangement on the crown with a modified pavilion schema engineered to enhance both luminous return and color saturation. The proportions yield a depth of 7.98 mm, producing a total depth of approximately 59 percent based on the mean diameter, a depth range that balances sparkle with stability in mounted settings. Clarity evaluates as very very slightly included at eye level, indicating only minute internal characteristics that do not detract from overall transparency or light performance. The color reads as vivid intensity, a saturated blue with strong violet undertones that responds well to directional light, and the surface exhibits excellent polish with crisp facet junctions and controlled girdle proportions, reflecting precise lapidary craftsmanship.

For custom work The Natural Gemstone Company offers this tanzanite as an ideal center stone for bespoke designs where scale, hue, and optical performance are critical. The oval outline with a length to width ratio near 1.28 provides an elegant elongated profile that suits solitaire rings, three stone settings, and drop pendants while maintaining secure bezel or prong mounting options. The mixed brilliant faceting maximizes scintillation when viewed face up, making this specimen particularly effective in halo configurations that emphasize the vivid body color, and the stone dimensions allow for protective bezel rails without obscuring the pavilion architecture. Heat treatment is noted as the standard enhancement applied to stabilize and optimize the blue-violet tone, a trade accepted process that produces a durable and permanent color improvement. Given the 9.90 carat weight, remarkable transparency, and expert cutting, this tanzanite is exceptionally well suited to high end custom commissions where the design will highlight both chroma and brilliance, and our team at The Natural Gemstone Company can advise on mounting orientation, setting depth allowance, and complementary accent choices to ensure the finished piece maximizes the material qualities of the stone.