1.20 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 1.20 carat oval blue sapphire, precisely proportioned at 6.40 by 5.18 by 4.50 millimeters, represents a convergence of natural material quality and exacting lapidary technique as presented by The Natural Sapphire Company. The stone is transparent with a vivid color intensity, a saturated true Ceylon blue that reads richly in both daylight and incandescent illumination. Its cut is a mixed brilliant design, employing a brilliant-style crown with carefully arranged star, bezel and upper girdle facets to maximize return of light, paired with a faceted pavilion engineered to balance color saturation and brilliance. The facet junctions exhibit tight symmetry and uniformity, the girdle thickness is even, and the overall proportions were chosen to preserve weight while minimizing windowing, producing an optimal face-up appearance for this size. Clarity is graded as very slightly included when evaluated at eye level, meaning the stone presents a clean visual field to unaided observation, with minute internal features that do not detract from the stone’s performance but do provide a natural fingerprint confirming its origin.

The narrative of this sapphire begins in the gem-bearing alluvial deposits of Ceylon, where artisanal miners recovered rough crystals that displayed promising cornflower to royal blue tones. From the rough, our gemologists at The Natural Sapphire Company undertook a mapping process using transmitted light and a 10x loupe to locate silk, rutile needles, and any mineral inclusions, orienting the rough to retain maximum color and eliminate potential extinction. Preforming was executed on diamond laps to establish the oval outline and pavilion angle, a critical stage where pavilion depth was set to support the vivid face-up color and to achieve the final weight of 1.20 carats. The cutter then executed a mixed brilliant strategy, balancing crown facet angles to create scintillation while shaping the pavilion facets to deepen color and maintain lively light return, a technical approach particularly effective for Ceylon sapphires which are prized for their velvety blue tone rather than mere brilliance alone.

Following the mechanical shaping, the sapphire underwent controlled heat treatment, a standard and internationally accepted enhancement for sapphires, applied to stabilize and deepen the blue chromophore and to reduce silk that masks color. This heat process was performed under monitored temperatures and atmospheres to avoid over-treatment, preserving the stone’s natural zoning and minimizing strain. After heat treatment the gem was re-polished to an excellent polish grade, restoring mirror-like facet surfaces and ensuring that facet junctions are crisp, which directly contributes to the sapphire’s liveliness and the saturation perceived at the table. The gem was then subject to final quality control, including microscopic inspection for polish quality, symmetry verification, and a final assessment of face-up color and clarity under both daylight-equivalent and incandescent light sources. Photographic documentation and scaled hand-model images were produced to illustrate orientation and practical appearance when set, showing how this 6.40 by 5.18 millimeter oval presents proportionally on a finger.

As a finished product offered by The Natural Sapphire Company, this sapphire is ready for bespoke mounting or to be set in classic or contemporary jewelry designs that complement its technical characteristics. The mixed brilliant cut responds well to settings that expose the pavilion to light, such as a four-prong or low bezel that preserves the stone’s depth and allows generous light interaction with the crown facets, while a slightly elevated head can enhance scintillation. For collectors and connoisseurs who value provenance and craftsmanship, the stone’s Ceylon origin, measured dimensions, very slightly included clarity at eye level, vivid color intensity, and excellent polish provide a clear and precise specification to inform design decisions. This sapphire’s journey from Ceylon rough to a precisely faceted, heat-treated gem represents the careful decision-making at every stage, from initial mapping and preforming to thermal enhancement and final polishing, ensuring a balance of natural character and lapidary refinement.