1.01 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This Ceylon origin round blue sapphire from The Natural Sapphire Company is a precise 1.01 carat, measuring 6.40 by 6.40 by 3.28 millimeters, finished in a mixed brilliant cut that marries a brilliant crown with a modified pavilion to balance scintillation and depth. The mixed brilliant layout concentrates finely faceted crown planes around a proportionate table to enhance face-up brilliance, while the pavilion’s tailored facets control internal reflection paths to maximize light return and color saturation. Clarity is assessed as very very slightly included at eye level, yielding a transparent window through which the light, rather than inclusions, defines the visual performance. The sapphire displays a light color intensity characteristic of Ceylon material, delivering a delicate blue that leans toward a cool, airy tone rather than a dense cornflower, and the gem benefits from an excellent polish that produces sharp facet junctions and minimal surface distortion. This stone is natural with no enhancement, so the observed hue and clarity are intrinsic to its crystal chemistry, and its corundum refractive behavior, with an index around 1.76 to 1.77 and very low birefringence, supports consistent optical performance in fine jewelry settings.

Under varied lighting conditions this sapphire exhibits predictable, refined behavior that will appeal to technically minded buyers. In strong daylight, the mixed brilliant geometry produces clean white brilliance interspersed with soft blue flashes, allowing the light color intensity to read as formally elegant and open, with subtle pleochroic variation between slightly cooler and marginally warmer blue tones as the stone is rotated. Under incandescent or warm LED light the sapphire’s light blue will take on a slightly richer appearance, with the pavilion facets deepening the blue and emphasizing localized color saturation rather than dispersion, since corundum’s dispersion is low compared with diamond. In fluorescent office lighting or cooler LEDs the stone emphasizes its crisp white scintillation and cooler blue flashes, making it appear brighter face-up. Candlelight and low ambient illumination accentuate the gem’s internal reflectivity, producing pinpoint scintillation from the brilliant crown facets and a gentle halo effect on the girdle, which is ideal for open prong settings that allow light entry through the pavilion. The negligible eye-level inclusions and excellent polish ensure consistent sparkle across lighting environments, making this 1.01 carat Ceylon sapphire a technically refined and versatile choice for precision settings.