2.79 Ct. Blue Cobalt Spinel from Tanzania

One beautiful transparent 2.79 carat cushion shape blue cobalt spinel, with dimensions of 8.13 by 6.57 by 6.25 millimeters, presents a rare combination of size and color that simply does not appear on the market every day. This gem has a mixed brilliant cut that maximizes both scintillation and color depth, and it carries a clarity grade of very slightly included when evaluated at eye level, offering remarkable transparency and visual purity. The color intensity is classified as intense, a deep vivid blue produced by natural cobalt trace elements, and the polish is excellent, delivering mirror like facets and sharp light return. There has been no enhancement of any kind, which means this stone arrives exactly as nature formed it, and its origin is Tanzania, a region known for producing exceptional colored spinels. The Natural Gemstone Company is proud to offer this specimen as an exceptional and uncommon find, especially when compared to the more typical small or less saturated blue spinels commonly available.

When you compare this cobalt spinel to other blue gemstones on the market, its advantages become clear. Compared to blue sapphire, this spinel offers a naturally vivid cobalt hue without the need for heat treatment, and the lack of enhancement preserves its natural value and rarity. Compared to ordinary blue spinels, which often present paler tones or smaller sizes, a 2.79 carat stone with such intense saturation is rare to encounter. Compared to synthetic or lab grown spinels, this natural Tanzanian stone carries provenance and the intrinsic appeal of a one of a kind mineral formation, not a manufactured product. Its mixed brilliant cut is especially advantageous, because it combines the fire and sparkle of brilliant faceting with the depth and color preservation of pavilion cutting, resulting in lively brilliance without sacrificing saturation. The clarity grade of very slightly included at eye level means that the stone reads as clean to most observers, which enhances its presence when set in jewelry, while still maintaining the natural character that collectors value.

Beyond aesthetics, this cobalt spinel offers practical benefits that support its position as a superior choice for discerning buyers. Spinel has a Mohs hardness of 8, which provides durable resistance to everyday wear, making this 2.79 carat cushion an excellent candidate for engagement rings, statement rings, pendants, and heirloom pieces that will be enjoyed for generations. Because this stone is unenhanced, it maintains long term stability in both color and clarity, unlike stones that have been filled or treated and may require special care. For designers and jewelers seeking a center stone that delivers rare color, strong saturation, and reliable performance, this cobalt spinel outperforms many alternatives in both uniqueness and value. The combination of size, intense cobalt blue color, and eye level clarity makes it a rare specimen that will appeal to collectors who understand that true rarity commands premium appeal.

At The Natural Gemstone Company we emphasize ethical sourcing and transparent documentation, and this Tanzanian cobalt spinel is offered with full details about its origin and characteristics, so buyers can purchase with confidence. Whether you are a collector seeking a standout natural example to add to a curated collection, a jeweler looking for a rare center stone to elevate a bespoke design, or an investor pursuing long term value in fine colored gemstones, this 2.79 carat cushion shaped cobalt spinel represents an exceptional opportunity. Stones of this color intensity and this size are scarce, and when you compare available options on the market, few will match the combination of vivid cobalt blue, natural unenhanced color, excellent polish, and eye level clarity. For a buyer who values rarity, natural beauty, and proven provenance, this gem stands apart, and The Natural Gemstone Company is pleased to make it available to those who seek something genuinely extraordinary.