1.33 Ct. Cobalt Spinel from Tanzania

This exceptional Other certified Blue cobalt spinel from Tanzania weighs 1.33 carat, a carat weight that places it firmly in the premium tier for cobalt spinels available on the market, and the size is immediately practical for a centerpiece in bespoke jewellery. The oval shape measures approximately 7.72 by 5.77 by 3.60 mm, a proportion that gives presence without overwhelming a setting, and the mixed brilliant cut has been employed to maximize scintillation and window control, producing a lively face up appearance even with the stone s dark color intensity. Transparency is excellent, and the clarity grade of very very slightly included, evaluated at eye level, delivers the eye clean look that discerning buyers seek, while the excellent polish ensures smooth facets and crisp reflections. Unlike many blue gems that are routinely heated or otherwise enhanced, this stone has no enhancement, which preserves the natural cobalt derived hue and contributes to long term value stability.

Compared to sapphires and treated spinels, this cobalt spinel offers a uniquely deep and pure blue that reads darker and more saturated, with a cool, slightly steely tone that is difficult to replicate in treated material or in lab created alternatives, and the 1.33 carat weight is an advantage over the smaller specimens commonly offered in the market, delivering both visual impact and better price per carat for a rarity like cobalt spinel. Collectors and fine jewellery designers will appreciate that this gem comes from Tanzania, a source known for producing high quality spinels, and the fact that it is Other certified gives confidence in its origin and properties. When set, the stone s mixed brilliant faceting and excellent polish will throw bright flashes despite the dark tone, creating a sophisticated, modern look that outperforms many mass market blue gems that rely on treatment to achieve color. At The Natural Gemstone Company we present this 1.33 carat oval cobalt spinel as a superior choice for anyone seeking a naturally deep blue, untreated, eye clean gem with substantial carat weight and enduring desirability.