5.12 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent C.Dunaigre certified blue sapphire presents as a 5.12 carat round, dimensions 10.06 x 9.85 x 6.45 mm, exhibiting an intense color intensity and an excellent polish. The gem is fashioned in a mixed brilliant cut, with a full brilliant style crown paired to a faceted pavilion, producing controlled light return and strong scintillation while maximizing face up saturation. Measured depth percentage is approximately 64.8 percent based on the average diameter, a proportion deliberately chosen to enhance the stone’s Ceylon blue saturation without excessive light leakage. Clarity is graded as very very slightly included at eye level, with inclusions minimal and well positioned so as not to impair the gem’s visual impact. The piece has been heat treated, a stable and industry standard enhancement used to refine color and clarity, and the treatment is fully disclosed on the accompanying C.Dunaigre certificate.

From a craftsmanship perspective, the cutting displays precise facet geometry, tight junctions, and consistent facet angles that contribute to uniform brilliance across the table. The mixed brilliant layout supports a vibrant pattern of flash and pinfire scintillation, while the modest crown height and carefully calibrated pavilion depth maintain a lively balance between brilliance and color saturation. The girdle is proportioned to facilitate secure setting without excessive metal cover, making this sapphire especially suitable as a solitaire center, halo focal, or a custom commission where the cutter’s proportions will influence how the intense blue occupies the face up view. The excellent polish supports a crisp, reflective finish that accentuates the rich Ceylon tone when viewed under daylight and artificial lighting alike.

The Natural Sapphire Company offers this stone with documented origin from Ceylon, Sri Lanka, and with an independent C.Dunaigre report, reflecting our sourcing standards for transparency and ethical responsibility. Our procurement protocols prioritize traceability, vetted supply chain partners, and full disclosure of enhancements, which aligns this sapphire with the expectations of a conscious collector seeking responsibly sourced gemstones. Buyers receive full information to make an informed decision, including certification details and treatment disclosure, and we facilitate options for bespoke mounting by artisans who adhere to fair labor practices. For routine care, we recommend gentle cleaning with warm soapy water, avoidance of sudden thermal shock, and professional inspection of settings, ensuring this durable yet precious sapphire remains a lasting and ethically sound centerpiece in a curated collection.