4.03 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 4.03 carat cushion shape blue sapphire is a study in disciplined proportions and refined presence, offered by The Natural Sapphire Company. The stone measures 10.22 x 7.23 x 5.39 mm, yielding an overall depth that calculates to approximately 62 percent relative to the mean of the length and width. That proportion produces a generous face up area while retaining sufficient depth to allow saturated color to develop through the pavilion. The sapphire is transparent, with an intense color intensity that reads as a vivid medium to deep blue when viewed in standard daylight and controlled lighting. As corundum, the sapphire rates nine on the Mohs hardness scale, making it an excellent choice for everyday wearable jewelry, while its substantial dimensions ensure a commanding presence as a solitaire or a center stone in a bespoke setting.

The mixed brilliant cut employed on this cushion shape is a deliberate fusion of faceting philosophies, combining a brilliant facet arrangement on the crown with a more restrained pavilion architecture designed to optimize light return and scintillation. On the crown the smaller triangular and kite facets are arranged to create lively, pinpoint scintillation that catches the eye with movement. The pavilion faceting is cut to a balanced depth, allowing internal reflection to reinforce the stone core and to protect against excessive light leakage. The cutter focused on symmetry of facet junctions and consistent girdle thickness to maintain optical performance, while the excellent polish on all facets enhances both mirror like light return and surface luster. The result is a stone that displays the vibrant flash of a brilliant cut, with the depth and color saturation conservation of a more traditional pavilion design.

Clarity for this sapphire is graded as very very slightly included evaluated at eye level, which indicates a gem that is effectively eye clean. Under loupe examination the sapphire may show minor pinpoint inclusions or thin silk like features consistent with natural corundum formation, but these do not detract from the gem at normal viewing distances. The clarity grade ensures that the intense blue color reads uniformly across the table, without apparent cloudiness or disruption to the color field. The piece has been heat treated, a stable and widely accepted enhancement in the trade, applied to improve color uniformity and to reduce the visibility of certain inclusions. Heat treatment in Ceylon sapphires is a controlled process that enhances the innate color potential of the stone, and when properly executed it produces a stable result that will retain its appearance under normal wear. The sapphire originates from Ceylon Sri Lanka, a source renowned for lively, saturated blue material that often presents a crisp, clean tonal center, and this stone exemplifies that regional character.

For the conscious collector, provenance and ethical sourcing are as important as the gemological attributes, and this sapphire has been selected and handled in line with those priorities by The Natural Sapphire Company. The sourcing pathway for this stone includes documented provenance from established Sri Lankan supply channels, adherence to responsible sourcing protocols, and a commitment to traceable chain of custody from mine to market. Those supply chain practices include workplace standards for fair labor, measures to reduce environmental impact at the production site, and investment in local communities through transparent commercial relationships. For practical stewardship, the cut and polish of the stone facilitate secure setting options that limit exposure to mechanical stress, and the heat treatment applied is stable for normal wear, cleaning, and maintenance. We recommend routine cleaning with warm soapy water and a soft brush, and professional inspection of the setting periodically to ensure continued performance. For collectors seeking a center stone that balances technical refinement, classic Ceylon color, and conscientious sourcing, this 4.03 carat cushion mixed brilliant sapphire represents a considered choice, and The Natural Sapphire Company can provide further documentation, high resolution imaging, and detailed provenance information on request.