4.02 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This item is a transparent 4.02 carat cushion shape blue sapphire, dimensions 9.31 by 9.17 by 5.25 millimeters, faceted in a mixed brilliant cut, clarity graded as very slightly included at eye level, color intensity assessed as intense, polish rated excellent, enhancement none, origin Ceylon Sri Lanka, offered by The Natural Sapphire Company. The cushion outline displays gently rounded corners and a balanced pavilion depth that preserves strong face up presence while retaining a generous table area that showcases the sapphire color. The mixed brilliant architecture combines a brilliant style crown with a pavilion that is optimized for light return, the result being a lively interplay of overall brilliance and controlled scintillation across the cushion plane. Eye level inclusions are minimal and well positioned, they do not impair transparency or light transmission, and the excellent polish and careful symmetry work by the cutter allow facet junctions to act as crisp light boundaries, enhancing satiny reflections at shallow angles and bright flashes at more direct viewing angles.

Optical and material properties are consistent with classic corundum behavior, the sapphire exhibits intense blue saturation with cool undertones that recall classic Ceylonish blue, pleochroic behavior is present and the mixed cut has been executed to mitigate strong color shifts by orienting the pavilion and crown facets to distribute the dominant hue evenly across the face up view. The cutter balanced crown and pavilion proportions to favor both color saturation and scintillation, producing well defined contrast patterns that animate the stone under movement. From a gemological perspective corundum delivers a high refractive index and modest birefringence which when combined with the mixed brilliant facet scheme leads to lively optical return and distinct facet windows where light is most concentrated. With a hardness of 9 on the Mohs scale and robust specific gravity typical of sapphire, this gem is suitable for everyday wear when set and serviced with standard precautions for corundum, the lack of enhancement ensures natural color stability and predictable behavior under thermal and light exposure.

This sapphire is exceptionally versatile for both casual and formal use, its cushion silhouette and intense Ceylon color translate seamlessly from a sporty bezel or low profile ring for daily wear to an elevated multi stone or halo setting for evening occasions. For a modern classic approach consider a four prong or low bezel setting in 18 karat white gold or platinum to emphasize the vivid blue and maximize apparent size, conversely warm tones such as 18 karat yellow or rose gold will introduce complementary contrast that accentuates the gem color and creates vintage appeal. Designers will appreciate the stone geometry for center stone applications in rings, pendants, or cufflinks, and the stone also responds well to accentation with small brilliant cut diamonds that reinforce contrast and increase perceived sparkle without overpowering the core hue. At The Natural Sapphire Company we document the origin, treatment status, and the key gemological parameters for every sapphire, and we stand ready to provide viewing under multiple lighting conditions and bespoke mounting recommendations, we also advise routine cleaning with warm soapy water and a soft brush and recommend professional inspection of settings at regular intervals to maintain both security and optical presentation.