1.55 Ct. Cobalt Spinel from Tanzania

Introducing a breathtaking gemstone that signifies the zenith of beauty and scientific marvel. This transparent 1.55 carat oval-shaped blue cobalt spinel, with dimensions measuring 7.82 x 6.11 x 3.76 mm, is an exceptional specimen that caters to gemstone enthusiasts and collectors who are infallibly after rarity and quality. Hailing from the rich geological deposits of Tanzania, this cobalt spinel exhibits an intense color intensity that captures the rare and vivid blue hues coveted by connoisseurs. The mixed brilliant cut design ensures that light is refracted and reflected within the stone to display its magnificent internal fire, further complemented by its excellent polish which enhances its brilliance and luster to an unparalleled level. The gemstone features a clarity grade of very slightly included (at eye level), ensuring that any inclusions are minimal and unobtrusive to the naked eye, thereby preserving the gem’s visual purity and vendibility.
What separates this cobalt spinel from other gemstones are its unique chemical and physical properties. Spinel, a magnesium aluminum oxide (MgAl2O4), crystallizes in the isometric system, typically resulting in octahedron crystal forms, though this particular stone is expertly fashioned into an oval shape. The cobalt element introduces the striking and deep blue coloration, one that parallels the allure of fine sapphires yet is prized for its individuality and relative rarity. This coloration not only adds to its mesmerizing appeal but also places it in the higher echelons of the gemstone market due to the relatively rare occurrence of naturally blue cobalt spinel.
Furthermore, cobalt spinels are treasured for their commendable hardness of 8 on the Mohs scale, which makes them durable and suitable for everyday wear, especially in jewelry applications like rings and necklaces. Their specific gravity ranges from 3.60 to 4.10, aligned with other spinel varieties, ensuring that the gemstone feels substantial in weight without being overly encumbering. The refractive index of cobalt spinel ranges from 1.718 to 1.735, with this particular spinel showcasing its maximum potential in optical performances through its well-executed mixed brilliant cut.
Beyond its undeniable physical allure, the gem's provenance from Tanzania further enriches its value. Tanzanian cobalt spinels are renowned in the gemological community for their extraordinary depth of color and quality due to the country's unique geological conditions. The Tanzanian origin of this gemstone implies it was formed in the high-grade metamorphic environments, where specific pressures and compositions required for the creation of high-quality spinel deposits are present.
This blue cobalt spinel elevates the pursuit of acquiring a precious gem to an attainable achievement, backed by scientific rigor and esteemed by gemological standards. Its multi-faceted allure lies in the interplay of its visual splendor, robustness, and geological significance, rendering it an unparalleled acquisition for any discerning collector's repertoire. This exceptional gemstone not only resolves the pursuit of a rare and beautiful item but also completes it with opulence and intellectual satisfaction, as only a piece of such exquisite quality can do.