0.79 Ct. Blue Sapphire from Ceylon (Sri Lanka)

One transparent 0.79 carat round blue sapphire from The Natural Sapphire Company measures 5.12 by 5.06 by 3.91 mm, and it is cut in a mixed brilliant style, with a clarity grade of very slightly included evaluated at eye level, vivid color intensity, and an excellent polish. This stone is untreated, with no enhancement, and is sourced from Ceylon Sri Lanka. The mixed brilliant proportions balance table and pavilion facets to maximize light return for a stone of this size, and the excellent polish preserves sharp facet junctions and crisp reflections. The vivid cornflower blue hue is evenly distributed across the table and crown, while the very slightly included clarity attests to transparent material that responds well to facet architecture, producing bright internal reflections and a clean face up appearance in hand and under loupe inspection.

In comparison to other gems in the blue corundum family and to commonly encountered blue gemstones, this Ceylon sapphire exhibits a particular combination of refractive behavior and surface luster that differentiates it. As a corundum, its refractive index sits higher than that of spinel, tanzanite, aquamarine, and blue topaz, and this higher index translates to stronger contrast and more lively facet reflections, while dispersion is modest, so flashes of spectral fire are restrained compared with diamond, and the visual effect is one of saturated blue brilliance rather than pronounced fire. Compared with heated or heavily modified sapphires, the lack of enhancement in this stone preserves natural transparency and the truer interaction of light with the crystal, often resulting in a clearer, more vivid face up presentation. Against blue spinel, this sapphire shows a denser light return and slightly more contrast at facet junctions due to corundum s optical properties, while tanzanite s strong pleochroism can cause color shifting that reduces consistent face up reflectivity relative to this stone. Overall this Ceylon round sapphire displays the crisp, deep blue reflections expected of high quality natural corundum, making it a reliable choice when optical performance and untreated origin are priorities.