0.69 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 0.69 carat oval blue sapphire presents a compact, precisely measured profile, with dimensions of 5.86 x 4.90 x 3.02 millimeters, an oval outline that balances length and width for versatile settings. The stone has been fashioned to a mixed brilliant cut, combining a faceted crown with a modified pavilion architecture to optimize both color saturation and scintillation. Clarity is graded as slightly included, evaluated at eye level, and the stone exhibits vivid color intensity with an evenly distributed blue when viewed face up. The polish is excellent, resulting in sharp facet junctions and clean light return across the table and crown facets. Enhancement is disclosed as heat treated, an industry standard for Ceylon sapphires that refines tone and transparency. Origin is Ceylon, Sri Lanka, and this sapphire is offered through The Natural Sapphire Company, where provenance and treatment are documented as part of our sourcing and disclosure practices.

The journey of this sapphire begins in the gem gravels and metamorphic host rocks of Sri Lanka, where corundum crystals grow in high temperature and pressure environments within gneiss and schist matrices. Our sourcing partners work directly with local miners and licensed artisanal operations, locating rough from both alluvial gravels and residual pockets in primary deposits. In the rough state the material exhibited the characteristic indicators of Ceylon origin, including a strong blue to slightly violet hue in transmitted light, fine silk inclusions and occasional crystal remnants. These internal features informed our decision making at the initial sorting stage, where rough pieces are assessed for orientation, color zoning, and potential yield. Samples are catalogued and tracked through our chain of custody, photographed, and evaluated under controlled lighting before being released to our cutting atelier, maintaining documented provenance from mine to market in keeping with our transparency standards.

Cutting and finishing were undertaken with deliberate technical choices to balance weight retention and optical performance. The cutter selected an orientation that preserved maximum face up color without over deepening the pavilion, producing a finished depth of 3.02 millimeters and an average diameter of approximately 5.38 millimeters, yielding an overall depth of about 56 percent relative to average diameter, a proportion that supports strong color concentration while retaining lively return of light. The mixed brilliant style employed a multi facet crown with well proportioned bezel and star facets to disperse light, while the pavilion uses modified facets to control the internal path of light and enhance the vivid body color. Facet junctions were executed with precision to avoid windowing and to maintain even color across the oval surface. Heat treatment was applied to reduce microscopic silk and to stabilize the blue chromophore, a controlled thermal process that improves clarity and saturates the blue without altering crystal integrity. The slightly included clarity grade indicates inclusions that are observable at ten power under microscopy and may be visible at eye level as small needles or pinpoint crystals, features that are characteristic of natural corundum and that do not materially affect the gemological durability of the stone.

In practical terms this sapphire offers excellent design flexibility for the discerning buyer who values technical refinement and natural origin. The oval outline and compact dimensions make it ideal for a solitaire ring with a modest table size to maintain deep blue saturation, or for a halo design that leverages surrounding diamonds to increase perceived size while preserving the stone as the focal color element. Metals with a neutral or warm tone, such as 18 karat white gold, platinum, or 18 karat yellow gold, will interact differently with the stone, with white metals emphasizing brilliance and yellow gold adding a warm contrast to the vivid blue. As a corundum species the material rates nine on the Mohs hardness scale, offering substantial resistance to everyday wear, though proper setting and protection of the girdle are recommended to safeguard the integrity of the cut. At The Natural Sapphire Company we provide full documentation of origin, treatment and our own photographic records, and our gemologists are available to discuss facet geometry, setting recommendations and the specific inclusion characteristics of this 0.69 carat Ceylon sapphire for buyers seeking a technically informed acquisition.