1.30 Ct. Blue Sapphire from Ceylon (Sri Lanka)

One beautiful transparent 1.30 carat cushion shape blue sapphire from Ceylon, dimensions 7.01 x 6.11 x 3.62 mm, mixed brilliant cut, clarity grade very slightly included evaluated at eye level, faint color intensity, excellent polish, heat treated enhancement. The cushion outline is softly rounded with gently radiused corners, a profile depth that reads well on the finger, and a table proportion that balances face up spread with depth. The mixed brilliant cutting style combines a brilliant facet arrangement on the crown with a modified pavilion faceting scheme to deliver controlled scintillation and broad flash. The excellent polish amplifies facet contrast and allows clean light transmission through the stone, creating a lively but subtle blue that is true to classic Ceylon material. The treatment history is stable heat, a widely accepted and durable enhancement for sapphires, disclosed for full transparency. The Natural Sapphire Company offers this sapphire as a collector grade example of Sri Lankan cutting tradition, where emphasis is placed on achieving maximum brilliance without forcing saturation.

Technically, the mixed brilliant cut on this cushion creates a specific interplay between small, well defined crown facets and larger pavilion facets, a relationship that manages return of light while enhancing perceived size. The pavilion depth at 3.62 mm works in concert with the 7.01 by 6.11 mm table and girdle proportions to produce an even light return, avoiding the windowing that plagues some shallow cuts and also avoiding excessive darkening that results from over deep cutting. The faint color intensity benefits from the mixed faceting because the brilliant crown produces scintillating flashes that distribute blue across the table, making the hue read more uniform under typical viewing conditions. Facet junctions and symmetry are precise in this piece, contributing to controlled dispersion and a pleasing pattern of light and dark areas that read as vitality rather than extinction. For designers seeking predictable optical performance in custom settings, these proportions provide a reliable basis for ring geometry, prong placement, and halo design, enabling accurate CAD modeling and bezel specifications.

From a clarity and durability standpoint, the very slightly included grade evaluated at eye level indicates inclusions that are minor and do not significantly affect light performance or structural integrity when properly set. In Sri Lankan sapphires, inclusions are often fine rutile silk, healed fractures, or mineral crystals, and this stone displays none of the eye distracting features that complicate mounting decisions. Because the stone is transparent with an excellent polish, inclusion locations and orientations can be anticipated and accommodated during setting to reduce stress concentration. Heat treatment has likely improved tone and uniformity of the blue, a standard and stable enhancement that does not compromise long term wear when the gem is cared for normally. The Ceylon origin contributes a particular light to medium tone and often a slightly grayish blue undertone, characteristics that lend themselves to versatile metal pairings and complementary accent stones. This sapphire reads as elegant and understated, an ideal choice for clients who prefer an airy, refined blue rather than a deep saturated hue.

For custom jewelry, the size and cushion shape of this 1.30 carat sapphire make it exceptionally adaptable. At approximately seven by six millimeters, it bridges the scale between a delicate everyday ring and a bold statement center, fitting comfortably into solitaire, halo, three stone, or cluster designs. A four prong mounting will maximize face up visibility and table light, while a low bezel or partial bezel can provide additional protection for active wearers without overly muting the sparkle. A well proportioned halo of brilliant cut diamonds will increase perceived color intensity and visual weight, while tapered shoulders or trapezoid side stones can elongate the finger visually and enhance center stone prominence. When designing a ring, allow for the 3.62 mm depth in seat specifications so the gem sits centered rather than over raised, maintaining optimal finger comfort and profile. Our gem design specialists at The Natural Sapphire Company can provide exacting recommendations for prong angles, bezel lip dimensions, and crown clearance to ensure the stone is presented to its best advantage, and we assist with CAD renderings and sample mountings to guarantee the finished piece meets your technical and aesthetic standards.