7.25 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent 7.25 carat cushion shape blue sapphire measures 12.21 by 9.13 by 5.79 mm, and displays a mixed brilliant cut that pairs a brilliant style crown with a modified pavilion arrangement to maximize return of light while preserving weight. The cutting strategy yields crisp facet junctions and a balanced facet map, delivering lively scintillation from the table and calibrated depth through the pavilion. Clarity is graded slightly included at eye level, with localized mineral inclusions and healed fissures that are typical of natural corundum and that contribute to the stone character without compromising overall transparency. Color is vivid in intensity, a saturated medium to strong blue with even distribution across the girdle plane, and polish is evaluated as excellent, indicating mirror like facet surfaces and precise finishing consistent with fine lapidary standards. This sapphire has been heat treated, a stable and widely accepted enhancement, applied to optimize blue hue and to reduce the visibility of rutile silk and other minute inclusions, while retaining natural crystal morphology and origin attributes traceable to Ceylon Sri Lanka, and this specimen is offered by The Natural Sapphire Company.

The narrative of formation begins millions of years ago in a high grade metamorphic terrane, where aluminous protoliths underwent prograde metamorphism under elevated temperature and pressure conditions. In such an environment, aluminum oxide mobilized within localized silica poor lenses and reacted with trace concentrations of iron and titanium to nucleate corundum crystals. Over geologic time, metamorphic recrystallization and fluid activity promoted crystal growth, allowing a gem sized corundum to develop in a chemically favorable microdomain. Trace element partitioning between the corundum lattice and the surrounding matrix determined the eventual blue hue, with titanium and iron participating in a charge transfer mechanism that produces the characteristic sapphire blue. Subsequent tectonic uplift, erosion, and secondary transport processes liberated the crystals into alluvial systems, where mechanical rounding and sorting occurred before recovery by miners and careful selection by gemologists.

The finished cushion mixed brilliant sapphire you see embodies that deep time history, from lattice level trace element chemistry to modern lapidary technique. The combination of vivid color intensity, controlled cutting proportions, and an excellent polish results in a stone that communicates both its geological origin in Ceylon and the technical care applied by cutters and graders. This balance of natural formation and skilled enhancement is the hallmark offering from The Natural Sapphire Company.