4.10 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This GIA certified deep blue cushion shape sapphire weighs 4.10 carats, a weight that immediately positions this stone within the premium bracket for natural Sri Lankan sapphires. The gem measures 9.57 by 7.30 by 5.84 millimeters, producing a depth to average spread ratio of approximately sixty nine point two percent, a proportion that contributes to the intense face up color and apparent saturation. The cushion outline is combined with a mixed brilliant facet arrangement, featuring a brilliant style crown composed of multiple kite and star facets and a pavilion that integrates both step and brilliant elements to control light leakage and maximize return. The mixed brilliant cut in this geometry has been executed to balance scintillation with color retention, so that the pavilion depth supports rich color saturation without causing excessive windowing. At 4.10 carats this sapphire offers a substantial face up presence when set, and the dimensional ratios yield an elegant rectangular cushion silhouette that reads larger than stones of similar weight with less efficient cutting.

Color quality is the central attribute of this piece. GIA grading records vivid color intensity and classifies the hue as deep blue, a tone and saturation combination that sits at the premium end of the color scale for Corundum from Ceylon. The vividity of the blue is supported by even color distribution across the crown and pavilion planes, with only minimal zoning that is typical of natural material and which does not impair visual uniformity. Clarity is described as eye clean when evaluated at normal viewing distances, meaning there are no inclusions visible to the unaided eye that would interrupt light transmission or diminish the gem aesthetic. Enhancement has been performed by heat treatment, a stable and industry standard process that enhances color and transparency without compromising structural integrity when done correctly. The GIA certification documents these specifics, including the origin as Ceylon Sri Lanka, a provenance that contributes to the market desirability due to the historical reputation of Sri Lankan deposits for producing sapphires with a particular balance of purity and saturated blue tone.

Craftsmanship is evident in the excellent polish and the precision of facet junctions and symmetry. The facet planes are crisp and meet with minimal deviation, enhancing both sparkle and controlled diffusion of light. The excellent polish grade indicates the lapidary work has removed surface irregularities while preserving facet angles calibrated to the stone proportions. For mounting, settings that protect the cushion corners while allowing broad table exposure are recommended, such as a four prong corner set or a low profile bezel with notched corners, to both secure the gem and maximize face up brilliance. Given the Mohs hardness of corundum, which ranks at nine, this sapphire is highly suitable for everyday wear applications in engagement rings or statement rings, provided appropriate protective setting choices are made. The 4.10 carat weight is especially significant from a valuation perspective because sapphire pricing commonly escalates per carat with increasing size while maintaining top color and clarity. This means that a large, vivid deep blue stone of Sri Lankan origin such as this occupies a rarified price tier relative to smaller or less saturated material.

The Natural Sapphire Company stands behind the documented quality of this specimen and can provide the full GIA report on request for independent review. Prospective buyers who appreciate the interaction of cut proportions, facet design, and material properties will recognize the technical merits that underlie the attractive face up presentation of this sapphire. For clients seeking a centerpiece that combines authoritative color, verified provenance, and thoughtful lapidary execution at the four carat scale, this 4.10 carat GIA certified deep blue cushion sapphire represents a compelling and rare option. Please contact The Natural Sapphire Company to arrange examination under controlled lighting, to obtain high resolution imaging and to discuss custom mounting options that will preserve and display the stone to maximum advantage.