4.29 Ct. Blue Sapphire from Ceylon (Sri Lanka)

One remarkable gemstone that we are pleased to present at The Natural Sapphire Company is a transparent blue sapphire weighing 4.29 carat, with precise dimensions of 10.45 x 7.93 x 4.79 mm. This sapphire has been fashioned into an emerald cut, a shape that emphasizes broad, elegant facets and linear geometry, and it shows a vivid color intensity that reads as a deep, saturated blue when viewed face up. At eye level the clarity is graded as very very slightly included, which means the stone displays exceptional transparency to the unaided eye, and the polish is excellent, producing a clean and reflective surface across the crown and girdle. The gem has been heat treated, an established and stable enhancement for sapphires that optimizes color and clarity while maintaining the natural crystalline integrity, and its origin is Ceylon Sri Lanka, a source long associated with highly desirable blue tones and consistent quality in corundum.

The emerald cut is central to how this sapphire communicates light, and the cutting style has been chosen to enhance inherent optical properties rather than to obscure them. Emerald cutting uses broad step facets on the crown and pavilion that create large, mirror like planes for internal reflection, and in a vivid blue sapphire those planes produce broad flashes of saturated color and controlled brightness. Because the pavilion angles and crown height are balanced for the stone dimensions of 10.45 x 7.93 x 4.79 mm, light that enters the table is guided through the body of the stone and reflected back as intense, even color rather than scattered sparkle, and the result is a rich, velvety blue face up appearance that remains lively in both daylight and incandescent illumination. The elongated rectangular outline and the proportionate depth contribute to even color distribution, reducing the likelihood of unwanted color zoning in the face up view, and the step facets emphasize depth and clarity, so the eye perceives a clean, structured interior that suits classic and contemporary settings alike.

From a clarity and treatment perspective this sapphire offers attributes that educated buyers value for both aesthetic and long term retainment of value. The very very slightly included grade at eye level indicates that inclusions are minimal and do not detract from overall transparency or light performance, and because the stone is essentially eye clean, the broad facets of the emerald cut are free to highlight the uniform blue saturation without interruption. Heat treatment is a routine and widely accepted enhancement in natural sapphires, applied to homogenize color and to diminish the visual impact of certain silk like inclusions, and in this case it has been used to bring forward the vivid blue while preserving the stone structural stability and natural origin. Ceylon or Sri Lanka origin is notable because material from this source often balances bright clarity with lively hue, and collectors respect provenance when evaluating relative rarity and historical desirability in the market.

For the discerning buyer seeking a sapphire that combines classical geometry with modern color performance, this 4.29 carat Ceylon emerald cut is an exceptional candidate, and The Natural Sapphire Company is proud to present it as part of our curated selection. At this carat weight and with the described proportions, the stone is versatile for use as a centerpiece in a ring, pendant, or bespoke design, and the excellent polish ensures crisp facet junctions and a refined surface that will reflect light cleanly from every angle. We encourage serious buyers to consider the gem not only for its immediate visual impact, but also for its intrinsic qualities that informed collectors appreciate, including provenance, treatment history, and the measurable dimensions that indicate how the cut enhances color and reflection. If you require further information, specific photographic angles, or assistance in selecting a mounting that will complement the emerald cut geometry and vivid blue tone, our specialists at The Natural Sapphire Company are available to advise on setting styles, matching stones, and certification options to ensure that your purchase aligns with both aesthetic preference and long term value considerations.