2.70 Ct. Blue Cobalt Spinel from Ceylon (Sri Lanka)

This listing presents one beautiful transparent 2.70 carat cushion shape blue cobalt spinel, sourced from Ceylon Sri Lanka, offered by The Natural Gemstone Company. The gem measures approximately 8.52 x 7.54 x 5.39 mm, and it has been expertly faceted with a mixed brilliant cut to balance scintillation and color saturation. At face level this stone is graded very slightly included, meaning that at typical viewing distances the inclusions are minimal and do not detract from the gem's overall transparency and visual appeal. The color intensity is described as intense, with a deep, vivid blue that is characteristic of cobalt rich spinels, and the polish is excellent, delivering crisp facet junctions and lively reflections. Importantly, this spinel has received no enhancement, so its color and clarity are wholly natural, a feature that discerning buyers often prioritize for long term value and authenticity.

From a gemological perspective this cobalt spinel offers attributes that make it both beautiful and practical for fine jewelry. Spinel has a Mohs hardness around 8, providing good resistance to everyday wear, and its refractive properties yield a bright, lively appearance when cut well. The mixed brilliant cutting style used for this cushion shape creates a pleasing contrast between the crown and pavilion facets, allowing light to enter the stone and reflect back as flashes of blue and white. The intense blue tone in this specimen is due to trace cobalt content, which produces a saturated hue distinct from typical spinel pinks and reds, and in many lighting situations it will show a steely to electric blue depending on viewing angle and background. The very slightly included clarity grade evaluated at eye level indicates the stone is essentially eye clean, and the absence of enhancement confirms that the face up color and saturation are the result of natural geologic conditions rather than human treatment.

For the educated buyer considering this gem for a bespoke engagement ring, pendant or collector piece, there are several practical considerations that enhance its long term desirability. The cushion shape and mixed brilliant cut create a substantial face up presence for a 2.70 carat stone, while the 8.52 x 7.54 mm dimensions allow for traditional settings without excessive metal coverage. Given the gemstone is unenhanced, routine care is straightforward, and standard jewelry maintenance such as gentle cleaning with warm soapy water and a soft brush will preserve the polish and brilliance. Prong settings that secure the girdle and allow light to interact with the crown facets will maximize sparkle, and lower profile bezel settings will accentuate the stone's deep color while offering additional protection for active wearers. The very slightly included classification means that typical inclusions will not compromise structural integrity, and the strong polish minimizes surface wear over time.

Beyond technical specifications, this cobalt spinel from Sri Lanka is appealing because its natural beauty will continue to captivate over the years. Natural, unenhanced gems with intense color and excellent polish tend to age gracefully, their visual character remaining stable with reasonable care, and in collections they often become focal pieces that define a personal style or heirloom. Ceylon spinel is recognized by gemologists for its fine color and crystal quality, and examples such as this one can be appreciated both for their aesthetic appeal and for their geological story. At The Natural Gemstone Company we pride ourselves on transparent sourcing and detailed documentation, and we can provide additional imagery and a professional gemological report on request to support your purchase. If you are seeking a rare, durable, and naturally vivid blue spinel that will hold its charm for decades, this cushion shaped cobalt spinel is an outstanding candidate.