0.85 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 0.85 carat round blue sapphire from Ceylon Sri Lanka is a study in proportion and optical design, with dimensions of 5.66 by 5.67 by 3.23 millimeters that produce a depth percentage of approximately 57 percent. The cutting style is faceted, executed in a mixed brilliant cut that combines a brilliant crown with a faceted pavilion geometry designed to balance scintillation and color saturation. The mixed brilliant layout optimizes light return in two ways, by using smaller crown facets to break light into flashes, and by employing longer pavilion facets to deepen the face up color. The resulting optical behavior is evident in the vivid color intensity of this stone, where the crown facets present lively blue flashes and the pavilion contributes to a sustained, even field of saturated blue when viewed face up. The excellent polish enhances facet junction crispness and minimizes surface diffusion of light, producing clean, well defined facet reflections without hazing or abrasion.

Clarity is graded as very very slightly included at eye level, a designation that signals inclusions are minimal and do not interfere with brightness or windowing when the stone is set. At this clarity grade the stone displays excellent transparency, allowing the mixed brilliant faceting to function without internal scattering that would reduce contrast. For technical buyers the corundum refractive indices in the range of 1.762 to 1.770 and the low birefringence are relevant to the visual performance, as they govern facet brilliance and pleochroic behavior. The gem shows stable pleochroism typical of blue sapphire, with subtle directional shifts between deep and slightly lighter blue tones under different viewing angles, a quality that the cutter has respected by aligning the table and pavilion to deliver balanced color distribution.

This sapphire has been heat treated, a standard and accepted enhancement in the trade that improves color uniformity and clarity without compromising structural integrity when performed at appropriate temperatures. Heat treatment in sapphires is applied to reduce silk and to enhance saturation, and when properly executed it is permanent under normal wear conditions. There are no secondary or surface treatments present, and the stone benefits from the clarity and polish work typical of high quality Sri Lankan material. Origin from Ceylon Sri Lanka contributes to the gem characterization, as Ceylon sapphires are often prized for their vivid and luminous blues, combined with fine crystalline clarity. For investors and connoisseurs the origin, the disclosed treatment, and the precision of the cutting are all material factors that influence long term desirability and resale value.

Owning this sapphire from The Natural Sapphire Company represents an investment in both aesthetic refinement and gemmological craftsmanship, because value in natural corundum is concentrated where color, cut, clarity, provenance, and disclosure converge. The mixed brilliant cut in a well proportioned round of this size maximizes face up impact for a 0.85 carat weight, delivering the visual presence of a larger stone through efficient light handling and depth control. The vivid color intensity and very very slightly included clarity grade ensure that the gem reads as a premium piece in settings that emphasize color, while the excellent polish and careful faceting work provide enduring brilliance and wearability. For buyers who prioritize technical attributes and long term value, this sapphire offers a documented origin, transparent enhancement disclosure, and the predictable performance of a precision cut natural corundum, all supported by the provenance and service standards of The Natural Sapphire Company.