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

This listing from The Natural Sapphire Company features one beautiful transparent 4.10 carat trillion cut bi color parti sapphire, presented with exact dimensions of 9.38 by 10.06 by 6.44 millimeters. The stone is faceted in a trillion style that maximizes light return and structural symmetry, and it displays a medium color intensity with distinct bi color separation that reads as cool blue tones graduating into lighter and slightly greenish or yellowish areas depending on viewing angle. The clarity has been graded as very slightly included, evaluated at eye level, which indicates minimal inclusions that do not detract from the face up appearance or brilliance. The polish is excellent, and importantly this sapphire has no enhancement, a characteristic that significantly increases desirability and rarity in the market because the vast majority of sapphires are heat treated to improve color and clarity. The combination of size, natural parti coloration, and unenhanced status makes this piece markedly rarer than similarly shaped sapphires in standard inventories, and it occupies a distinct niche for collectors and designers seeking an uncommon natural specimen.

From a gemological perspective the attributes of this sapphire are particularly notable. The 4.10 carat weight in a trillion cut yields a substantial face up size with lively scintillation, owing to the thoughtful faceting that balances table size, crown angles, and pavilion depth to preserve weight while optimizing brilliance. Very slightly included clarity at eye level means the inclusions are minor and typically only seen under magnification or when the stone is tilted under direct light, which preserves clean visual impact for mounted jewelry. The medium color intensity describes a balance between saturation and lightness, allowing both the blue and the secondary tones to be visible without one color dominating excessively. Origin is Ceylon, Sri Lanka, a provenance renowned for producing parti sapphires with complex, attractive color zoning and a silky to vivid hue profile. Ceylon sapphires have a long held reputation for fine color and excellent crystal quality, and an unenhanced parti sapphire of this dimension from that origin is uncommon, because larger rough crystals that yield attractive multi color finished gems without heat treatment are rare in production.

For the educated buyer this sapphire represents both a distinctive aesthetic and a measured investment in natural rarity. The unheated status, confirmed clarity grading at eye level, measured dimensions, and excellent polish are the technical credentials that informed buyers use to compare value across the market, and each of these factors contributes to premium positioning relative to heat treated or heavily included material. The trillion cut makes this gem an ideal centerpiece for bespoke settings, where its triangular silhouette provides a contemporary focal point and efficient use of carat weight, and where the parti coloration can be oriented to show either symmetric color balance or a directional flash depending on design intent. We recommend formal documentation of origin and treatment status for long term provenance, and The Natural Sapphire Company will provide detailed imagery and grading notes to support appraisal or resale considerations. For collectors and designers who prioritize natural color, geological origin, and classical gemological grading, this 4.10 carat Ceylon parti sapphire presents a rare opportunity to own a transparent, unenhanced, and skillfully cut stone that stands apart from more common sizes and uniformly colored material.