3.59 Ct. Blue Sapphire from Ceylon (Sri Lanka)

One transparent 3.59 carat oval blue sapphire, measuring 10.83 x 7.57 x 4.85 mm, presents a classic oval silhouette with proportions that balance presence and wearability. The clarity grade is very very slightly included, evaluated at eye level, which denotes exceptional transparency for a natural material of this size. Color is described as vivid in intensity, a saturated Ceylon blue that reads strong and pure under daylight and incandescent sources alike. The origin of this sapphire is Ceylon, Sri Lanka, and the gem has been heat treated to enhance color uniformity and remove certain growth features, a standard and stable enhancement in corundum. The Natural Sapphire Company offers this stone as a natural, gemological specimen, with pedigree and documentation available upon request.

The stone has been fashioned in a mixed brilliant cut, combining a modified brilliant crown geometry with a structured pavilion faceting scheme to optimize both scintillation and depth of color. The crown displays a well proportioned table that allows controlled light entry, while the crown facets are oriented to distribute flash and fire without sacrificing color saturation. The pavilion exhibits layered faceting that returns light through the crown, yielding lively facet contrast along the length of the oval. Symmetry is even, girdle thickness is consistent, and the excellent polish contributes to crisp facet junctions and minimal surface disturbance. Based on the dimensions, the length to width ratio is approximately 1.43, and the depth at 4.85 mm produces a depth percentage of approximately 53 percent when calculated against the average diameter, a proportion that supports a vivid face up appearance while retaining strong light return.

From a gemological perspective, this sapphire displays the classic optical properties of corundum, including a refractive index in the range expected for natural blue sapphire, and modest pleochroism that can present slightly different blue tones when viewed along different crystallographic directions. The very very slightly included clarity grade indicates that inclusions are minute, internal, and do not interrupt the stone geometry or transparency when viewed face up, allowing a clean visual field and a saturated face up color. Heat treatment has been applied in a controlled annealing process to improve color saturation and overall clarity, an enhancement technique that is widely accepted and stable under normal wear conditions. The excellent polish and precise facet execution reduce light leakage, so the gem maintains intense color saturation and lively return of light, features that are particularly prized in Ceylon sapphires.

In practical terms this sapphire offers both visual impact and enduring performance, due to the intrinsic hardness and chemical stability of corundum. With a Mohs hardness of nine, the gem resists abrasion and retains facet sharpness and polish over many years when set and worn in typical jewelry environments. Routine maintenance is straightforward, requiring periodic cleaning in warm water with mild detergent and a soft brush, and occasional professional inspection to ensure secure setting. The stone is well suited to center stone applications in rings, pendants, or bespoke commissions where its vivid color and clean transparency will remain the primary visual focus. Over time the combination of exceptional cut, excellent polish, and natural Ceylon color will continue to captivate, as the stone preserves its saturation and brilliance with normal care. The Natural Sapphire Company stands behind the quality and origin of this sapphire, and we can advise on settings and mounting styles that will protect the gem while maximizing its optical performance and long term appeal.