3.39 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent 3.39 carat asscher octagon shape blue sapphire measures 8.51 x 7.77 x 5.40 millimeters, with an asscher cut that emphasizes symmetry and engineered facet relationships. The cut exhibits a high crown, a broad open table, and stepped crown and pavilion facets arranged in concentric squares with trimmed corners that define the octagonal outline. Proportional depth is approximately 66 percent based on the average of length and width, a proportion that enhances internal reflection while maintaining strong face up color. Clarity is graded very slightly included, evaluated at eye level, with minor needle and crystal inclusions that are not visually distracting at typical viewing distances. Color presents as medium intense blue, evenly distributed, characteristic of Ceylon origin, and the stone has been heat treated to stabilize and intensify hue, with an excellent polish that produces crisp facet junctions and even facet planes.

The geometric faceting of this asscher sapphire is deliberately configured to maximize light play through controlled contrast and directional flashes, producing a hall of mirrors effect rather than a scatter of pinpoint scintillation. The concentric step facets on crown and pavilion act as planar mirrors that channel light laterally across the stone and reflect it back through the table as broad, deep flashes of blue and lighter flashes at facet edges. Precise symmetry and well executed pavilion angles increase the efficiency of total internal reflection for corundum, whose refractive index is approximately 1.76 to 1.77 and birefringence is low, thereby favoring strong, saturated color with lively internal movement. At 3.39 carats this piece offers a commanding table presence and a substantial pavilion volume that enhances depth and luster. For gem professionals and discerning buyers seeking technical refinement, The Natural Sapphire Company presents this Ceylon asscher as an example of superior craftsmanship, disclosed heat treatment, and excellent polish, ideally suited to settings that emphasize geometry and engineered light performance, such as bezel frames with open galleries or four prong mounts that allow the engineered facet structure to interact fully with light.