1.06 Ct. Bi Color / Parti Sapphire from Ceylon (Sri Lanka)

This 1.06 carat oval bicolor parti sapphire from Ceylon is an exemplar of natural corundum structure and masterful lapidary work, and it is offered by The Natural Sapphire Company. The stone measures 6.47 by 5.50 by 3.30 millimeters, yielding a depth percentage of approximately 55 percent when the average diameter is taken into account, and it displays an intense color intensity that remains vivid through multiple viewing orientations. The gem is faceted with a mixed brilliant style, combining a brilliant facet arrangement on the crown with a modified pavilion geometry, and this hybrid approach is chosen deliberately to reconcile maximum scintillation with optimal color saturation across the elongated oval outline. No enhancement has been applied to this sapphire, and its unheated origin from Sri Lanka contributes to the specimen s geological integrity and collector value.

The interplay between the sapphire s intrinsic optical constants and its facet architecture is what produces a sparkle that is unmatched by many other gems of similar size, and this is a feature that technical buyers will immediately appreciate. Corundum s refractive index in the range of approximately 1.762 to 1.770 elevates internal light return relative to most other transparent gemstones, and the stone s modest dispersion delivers flashes of spectral character without overwhelming the primary body colors. The mixed brilliant cut enhances this behavior by using a carefully proportioned table and a crown facet pattern that directs incident light into the pavilion, where a series of precisely angled facets encourage coherent internal reflection. The pavilion s modified brilliant facets act to concentrate and reemit light in directional bursts, producing both broad areas of brightness and pinpoint scintillation. The oval outline, with its slightly elongated length to width ratio, further contributes to dynamic light performance, creating a linear interplay of brightness bands that shift with gaze and movement, and the result is a perceptible depth and liveliness that outperforms many standard cuts of equivalent carat weight.

Clarity and surface finishing are crucial to the perceived sparkle, and this piece has been graded slightly included at eye level, indicating that natural inclusions are present but do not materially interrupt light propagation when the gem is viewed without magnification. Inclusions in sapphires typically consist of mineral crystals, rutile silk, or faint growth zoning, and in this specimen the internal features are small and strategically placed so as not to create light leakage or dull zones. The excellent polish achieved by the cutter is evident at the facet junctions and on the girdle, where crisp facet edges and mirror smooth facets maximize specular reflection. The absence of surface abrasion and the accuracy of facet alignment preserve the intended angles that control return of light and the uniformity of contrast. Additionally, the natural zoning inherent to parti sapphires yields a refined, controlled dichroism, with color planes that exhibit complementary tones when rotated, and this pleochroic effect is exploited by the lapidary to create alternating planes of saturated color and reflective brightness.

As presented by The Natural Sapphire Company this bicolor parti sapphire is both a study in gemological properties and a practical candidate for a bespoke setting that highlights its structural advantages. The stone s hardness of nine on the Mohs scale ensures durability for daily wear, while its untreated status preserves the authentic spectral characteristics that collectors value. For setting considerations, the oval mixed brilliant design benefits from an open mounted head that allows light to enter through the pavilion and emphasizes the internal light paths engineered by the facet design, and a well proportioned bezel or prong configuration will secure the gem while avoiding obstruction of the light return. In summary, the combination of corundum s high refractive index, the deliberate mixed brilliant faceting, the attentive polishing, and the natural bicolor partitioning produce a sparkle that is both technically coherent and aesthetically compelling, offering a performance that stands out in the lapidary market and a provenance from Ceylon that affirms its pedigree.