6.28 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent oval blue sapphire weighs 6.28 carats and measures 12.32 by 9.92 by 5.32 millimeters. It has been faceted in an elegant mixed brilliant cut that combines a faceted pavilion with a modified crown to optimize both color and light performance. The color intensity is described as intense, presenting a rich Ceylon blue that is both deep and lively, and the polish is excellent, providing sharp facet reflections and a smooth surface finish. Origin is Ceylon Sri Lanka, a provenance that has long been prized by collectors and connoisseurs for its capacity to yield saturated yet luminous blue sapphires. Enhancement is disclosed as heat treated, a stable and widely accepted treatment in trade that enhances clarity and color without compromising structural integrity. At The Natural Sapphire Company we provide full disclosure of treatments and origin because provenance and transparency matter to informed buyers.

From a gemological grading perspective this sapphire is categorized as slightly included when evaluated at eye level, which indicates small natural inclusions that are visible to close inspection but do not dominate the gem or significantly impede light transmission. Slight inclusions can often be pinpoint crystals or fine silk that act to soften and enrich blue saturation, and in many instances they contribute to the overall character and authenticity of a natural corundum crystal. Corundum, the mineral family that includes sapphires, has a refractive index in the range of about 1.76 to 1.77 and a modest dispersion near 0.018, characteristics that govern how light bends and separates within the gemstone. The mixed brilliant cut on this oval has been executed to balance these optical properties, using a precise relationship between crown and pavilion facet angles to maximize light return and scintillation while maintaining the stone s intense face up color. Excellent polish and careful facet junctions further reduce light loss at the surface and enhance contrast, yielding crisp flashes that are attractive to a discerning eye.

The unmatched sparkle of this sapphire is a consequence of both its intrinsic crystal structure and the way it has been cut and finished. Corundum s trigonal crystal lattice and its refractive index result in strong internal reflection and controlled light leakage, so that when light enters the stone it is redirected by the facet planes into lively flashes of brilliance and contrast. The mixed brilliant cut amplifies these effects by introducing small, well proportioned facets that break light into numerous scintillation points, and by aligning facet angles to the stone s optical axes to take advantage of subtle pleochroism. Pleochroism in sapphire means that the stone can display different shades of blue from different viewing angles, and a skilled cutter will orient the table and pavilion to present the most desirable color face up while still permitting dynamic flashes of light as the gem moves. The oval shape contributes to the perception of liveliness by elongating the face up silhouette and concentrating color toward the center, while the measured depth of five point three two millimeters supports a pleasing balance between brilliance and saturation. Fine facet edges, symmetry, and exceptional polish all serve to enhance light return, producing a sparkle that reads as both internal fire and crisp surface reflections, qualities that are immediately apparent when the stone is viewed under natural or artificial light.

For the educated buyer this sapphire represents a sound combination of aesthetic appeal, documented origin, and responsible treatment disclosure. Ceylon sapphires are sought after for their characteristic clarity and range of blue tones, and a 6.28 carat example with intense color and transparent body color is relatively rare in the market. Heat treatment in this instance is stable and improves clarity and color while preserving the gem s natural characteristics, a practice that is well accepted by gemological laboratories and collectors when properly disclosed. The slightly included clarity grade signals natural origin and individual character without compromising durability for jewelry use, and the dimensions and mixed brilliant cut make this stone well suited to a variety of bespoke settings where its sparkle and color can be showcased. At The Natural Sapphire Company we stand behind our descriptions and provenance information, and we welcome inquiries about setting options, certification, and care recommendations to ensure this exceptional Ceylon sapphire continues to perform beautifully for generations.