0.66 Ct. Greenish Blue Sapphire from Ceylon (Sri Lanka)

This transparent 0.66 carat oval greenish blue sapphire measures 5.80 x 4.38 x 3.18 mm, and presents a classic proportion set that balances face up size with optical performance. The gem has been fashioned in a mixed brilliant cut, combining a precision brilliant style crown with a carefully faceted pavilion that maximizes return of light and controlled dispersion. Color is described as greenish blue with vivid intensity, the polish is excellent, and clarity is graded as very slightly included when evaluated at eye level, confirming strong transparency and visual purity. Origin is Ceylon Sri Lanka, and the stone is unenhanced, retaining natural color and internal features that are essential to collectors and connoisseurs. At 0.66 carat and with the given depth of 3.18 mm, this oval reads larger than many stones of comparable weight, a function of efficient pavilion cutting and a broad table that presents vibrant color across the face up view.

The mixed brilliant faceting of this sapphire directly informs its light behavior, and in this example the cutter has employed a modified brilliant crown with well proportioned star and kite facets that feed light to a series of step or slightly chevroned pavilion facets, producing a refined interplay of scintillation and face up color. Facet junctions are tight, symmetry is consistent across all axes, and the excellent polish produces crisp internal reflections and lively mirrors on the crown facets. The pavilion design has been executed to avoid closed minded areas, preserving lively contrast and allowing the vivid greenish blue to alternate with deeper blue flashes as the stone moves. The oval outline has been kept symmetrical with gentle shoulder rounding, which reduces pinching of color at the girdle and minimizes unwanted bow tie effects, a consideration important for rings and pendants where movement changes the light environment.

Color grading in this sapphire favors vivid intensity, and the greenish blue hue sits on the desirable spectrum for Ceylon origin sapphires where cooler blue tones with a slight green component are common and prized for their freshness and versatility in jewelry design. The stone displays subtle pleochroism, with a primary face up appearance of saturated blue that shifts to a slightly greener blue when viewed along certain crystallographic axes, a behavior consistent with natural corundum from Sri Lanka. Because the stone is unenhanced, the observed color is intrinsic to the crystal chemistry and growth environment, and is stable under normal wear. The cut proportions and polish further influence perceived saturation, concentrating color toward the center while allowing lighter outer zones to create a lively, three dimensional look. For designers and buyers evaluating mounting options, this means the gem will read as vivid and lively in both open backed settings and in closed bezel styles, with the cutter balancing table size and pavilion depth to optimize both face up presence and light return.

Inclusions in this sapphire are described as very slightly included at eye level, and rather than detracting from the gem they serve as unique internal fingerprints that confirm natural origin and untreated status. Typical inclusion features observed in Ceylon sapphires that can appear here include fine silk networks of rutile needles, small crystalline pinpoints, and subtle growth zoning, all of which can be used by experienced gemmologists as part of the identification and origin narrative. These inclusions are positioned and sized such that they do not interrupt the stone wide open clarity, instead they contribute to a textured internal landscape that interacts with light to enhance depth and to provide identifying markers for future certification or matching exercises. The very slightly included grade indicates eye clean appearance in most viewing situations, while still allowing loupe level character to be visible to the trained observer, an attribute many collectors prefer because it verifies natural formation without compromising beauty or wearability. The Natural Sapphire Company stands behind the provenance and description of this sapphire, and can provide detailed imaging and gemmological reporting that documents these inclusion signatures, offering assurance to buyers who prioritize natural, unenhanced corundum with traceable origin and superior craftsmanship.