1.13 Ct. Cobalt Spinel from Ceylon (Sri Lanka)

This 1.13 carat transparent oval blue cobalt spinel measures 6.70 by 5.63 by 3.76 millimeters and is a refined example of collector-grade material. Cut as a mixed brilliant, the gem pairs a finely faceted crown with a precision pavilion to maximize scintillation and return of light, creating vivid flashes across the table and facets. The clarity is described as very very slightly included evaluated at eye level, indicating minor inclusions that do not detract from face-up beauty and that remain difficult to discern without magnification. Color is a medium intense blue produced by cobalt, presenting an even and saturated tone that reads vivid in both daylight and incandescent light. The polish is excellent, and the stone has received no enhancements, preserving its natural character and stability. Origin is Ceylon Sri Lanka, a source historically prized for high-quality blue spinels and known for producing material with fine color and good crystal quality.

From a gemological and investment perspective this cobalt spinel is notable for several reasons that make it an exceptional centerpiece in any collection. Spinel is a durable gemstone with a Mohs hardness of about 8 and a refractive index around 1.718, properties that contribute to lasting wearability and lively brilliance when well cut. The mixed brilliant cut applied to this oval shape optimizes both brilliance and fire while preserving weight and outline, producing a balance that flatters rings, pendants, or bespoke settings. The combination of medium intense cobalt blue color, very very slightly included clarity at eye level, excellent polish, and the absence of treatments increases both aesthetic appeal and market desirability, especially given its Ceylon provenance. For the educated buyer this stone represents a rare opportunity to acquire a natural, untreated cobalt spinel with transparent bodycolor and exceptional cut quality. The Natural Gemstone Company stands behind the description and provenance of this gem, and we welcome inquiries regarding viewing, certification options, and custom setting recommendations to showcase the stone as the focal point of a refined jewelry piece.