0.65 Ct. Bi Color Sapphire from Ceylon (Sri Lanka)

This transparent 0.65 carat asscher octagon shape bi color sapphire presents precise proportions and deliberate cutting choices, the stone measures 5.04 by 4.74 by 2.78 millimeters, the mean of the length and width is approximately 4.89 millimeters which yields a depth ratio of approximately fifty seven percent, this depth percentage sits within an optimal range for a step cut that seeks to balance internal reflections with table brilliance, the asscher faceting here is a traditional concentric step pattern, square and octagonal facets on the crown and pavilion create parallel facet planes that generate the classic hall of mirrors effect when light interacts with the pavilion, the cut emphasizes symmetry and proportional bezel facets, the large open table and truncated corners of the octagon profile provide a gallery for the bi color presentation, the cutter maintained tight facet junctions and consistent girdle alignment to avoid light leakage and to maximize the interplay between the blue and yellow color zones.

Color and clarity are central to the technical appeal of this sapphire, the stone exhibits medium light color intensity which produces a delicate pastel expression rather than saturated heaviness, the bi color distribution transitions between a cool blue and a warm yellow within the same crystal, this zoning is a product of growth sector variation and trace element partitioning, pleochroic behavior is evident under directional light, the asscher geometry with its broad table reveals the subtle dichroism and allows color zoning to be read from multiple viewing angles, clarity is graded as very slightly included when examined at eye level, these inclusions are minor pinpoints and faint rutile remnants that do not detract from the overall transparency or from the step facet reflections, excellent polish on all facet planes ensures clean light return and crisp facet lines, together the clarity grade and the excellent polish make this stone particularly well suited to settings that expose the table and require visual purity, the asscher style intolerant of heavy included material benefits from the clarity this sapphire offers.

From a craftsmanship and enhancement perspective this sapphire has been heat treated, heat treatment is an established and stable enhancement that remobilizes trace elements and can reduce the visual impact of fine silk networks while improving color uniformity, in this specimen the treatment enhances the separation and clarity of the bi color zones without producing an artificial saturation, the result is a naturally feeling palette that responds predictably to different lighting conditions, the cutting strategy took that treatment into account, the pavilion angles were calibrated to the refractive index typical of corundum to preserve contrast between facet planes and to avoid windowing that would wash out the subtle bicolor effect, the cutter also chose an asscher octagon to accentuate color zoning across the step facets, this approach demands precise lap work and repeated polishing stages to retain sharp facet intersections and to achieve the excellent polish grade listed.

The origin of this sapphire is Ceylon Sri Lanka, provenance from Sri Lanka carries both geological and market significance, Ceylon sapphires are formed under unique metamorphic conditions in gem gravels and primary deposits that often produce stones with exceptional clarity and finely distributed trace elements, historically Sri Lankan sapphires have commanded collector preference for their light interacting qualities and for the range of pastel to vivid tones they can manifest, the fact that this is a bi color sapphire from Ceylon increases its rarity profile, gem buyers value documented origin because it informs expectations regarding inclusions, pleochroism, and response to heat treatment, at The Natural Sapphire Company we emphasize provenance as part of the gem narrative, we document treatment and cutting choices so that knowledgeable buyers can assess optical behavior and setting suitability, for clients seeking a technically refined sapphire for a solitaire engagement piece, a bezel set modern ring, or a stepped halo that echoes the asscher geometry, this 0.65 carat asscher octagon bi color sapphire represents a considered balance of natural formation, measured enhancement, and exacting faceting technique.