4.17 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This sapphire is a transparent round blue sapphire weighing 4.17 carats, with precise dimensions of 9.86 x 9.77 x 5.16 mm, presenting a mixed brilliant cut that combines brilliant crown faceting with complementary pavilion faceting to balance scintillation and color depth, clarity grade is very very slightly included evaluated at eye level, color exhibits vivid intensity, and polish is excellent, origin is Ceylon Sri Lanka, enhancement is heat treated. The mixed brilliant profile creates a classic round silhouette with a well centered table and even outline, and the stone displays exceptional optical balance between light return and color saturation. The measured proportions yield a depth of 5.16 mm over an average diameter of 9.815 mm, which corresponds to a depth of approximately 52.6 percent, a proportion that favors balanced performance where face up brightness and color are both optimized. The weight of 4.17 carats corresponds to a substantial visual presence for a round sapphire while retaining the practical dimensions required for a wide range of settings.

The faceting approach is executed with technical precision to maximize both brilliance and color delivery. The mixed brilliant cut employed on this gem uses a brilliant style on the crown to create numerous kite and star facets that break incoming light into rapid scintillation, while the pavilion faceting includes modified step and tapered facets that concentrate light back through the crown to enhance perceived color saturation. Facet junctions are crisp and meet with controlled angles to reduce light leakage, and facet symmetry is aligned to maintain even dispersion across the table. Excellent polish across all facet planes ensures minimal surface scattering, which preserves the stone s internal clarity and the purity of transmitted color, and the combination of these cutting decisions produces a lively yet deep presentation under both natural daylight and artificial illumination.

Clarity characteristics are consistent with a very very slightly included grade when evaluated at eye level, indicating that inclusions are minimal and do not detract from the gem s overall visual impact. Under magnification these internal features may resolve to minute pinpoint crystals or delicate silk like rutile filaments, which are often characteristic of corundum from Ceylon, yet none of these features impairs the stone s transparency. Because the stone is evaluated as very very slightly included at eye level it will read as essentially eye clean in most jewelry applications, allowing the vivid blue color to remain the dominant attribute. The excellent polish and careful facet alignment further minimize any potential optical disturbances from internal features, so the stone presents with an even, open appearance when set in a ring, pendant, or other fine jewelry.

Color is the defining attribute of this sapphire, described as vivid in intensity with a balanced medium to medium deep tone that is emblematic of fine Ceylon sapphires. The hue is a pure blue with a lively saturation that gives the appearance of strong color even under varied light sources, and the mix of cut and proportions has been calibrated to bring forward both brilliance and hue saturation without darkening the pavilion. Heat treatment has been applied in a controlled manner to enhance color uniformity and to reduce any minor internal disruptions, and this treatment is stable and commonly practiced to reveal the stone s ideal optical qualities. The result is a vivid blue that displays pleasing face up color, with a velvety yet bright character when viewed directly, and a subtle depth when observed at steeper viewing angles.

This sapphire carries the cultural and gemological legacy of Ceylon sapphires, a lineage that has long been associated with regal jewelry, devotional objects, and talismanic use throughout South Asia and the West. Historically Ceylon sapphires have been favored for signet rings, temple adornments, and set stones for crowns and ceremonial pieces, prized for their lively brightness and resilient wearability. The Natural Sapphire Company presents this gem with documented provenance and with the firm commitment to responsible sourcing and expert cutting that honors that tradition. For setting recommendations choose designs that allow light to enter the pavilion and traverse the crown facets, such as open prong or low bezel mounts, to maximize color and brilliance. The stone is well suited to heirloom rings and statement pendants and will hold up to daily wear given the inherent hardness and stability of corundum, though routine care is recommended to preserve the excellent polish and vivid color. For collectors and connoisseurs seeking a technically refined Ceylon sapphire with classic heritage and modern cutting precision this 4.17 carat round mixed brilliant sapphire represents an exemplary choice from The Natural Sapphire Company.