0.72 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This oval blue sapphire weighs 0.72 carats and measures 6.36 by 4.69 by 3.05 millimeters, it is transparent with an intense color saturation, it has a mixed brilliant cut, and it is graded slightly included when evaluated at eye level. The gem displays an even, vivid blue that is characteristic of Ceylon origin, and the surface finish is an excellent polish that contributes to clean reflections across the crown facets. The pavilion depth, approximately 55 percent of the average diameter, is well balanced for an oval of these proportions, permitting efficient light return while preserving the stone's depth of tone. The sapphire has been heat treated, a stable and widely accepted enhancement that refines color and clarifies internal silk without altering the fundamental structure of the corundum, and The Natural Sapphire Company presents this stone with documented origin and grading information.

The mixed brilliant cut is the central factor in the sapphire's exceptional scintillation and perceived sparkle, the cut combines a brilliant facet arrangement on the crown with a modified pavilion geometry, this combination maximizes the interaction between incoming light and the stone's internal optical properties. Corundum has a refractive index that encourages strong internal reflection, when properly faceted at precise angles light is captured, redirected, and returned through the crown as concentrated flashes and scintillation. The brilliant style crown facets create a network of small, bright flashes by breaking the light into a pattern of reflections, while the pavilion facets and their polished junctions influence the angles at which light is retained and returned, the result is a lively, multi faceted play of light that reads as sparkle even in subdued lighting. The sapphire's relatively low dispersion compared with diamond means it produces more white sparkle and selective colored flashes, this quality emphasizes tone and saturation rather than spectral fire, the intense blue color provides strong contrast to the bright facet reflections, enhancing the perception of brilliance. The excellent polish minimizes surface scattering, each facet edge and facet plane acts as a mirror at small scale, sharp facet junctions produce crisp flashes when the stone moves, and the mixed cut balances scintillation and color performance to create a visual effect that is both lively and deep.

Internal clarity features are described as slightly included at eye level, the inclusions are present but do not materially diminish transparency or the stone's capacity to return light, in some cases fine inclusions can diffuse light subtly and contribute to a velvety appearance that enhances color uniformity. Heat treatment has improved the stone's visual clarity and stabilized the intense blue tone that is associated with Sri Lankan sapphires, the trace elements responsible for the blue hue are distributed through the crystal lattice, and when combined with the precise facet geometry this produces a saturated, consistent color that supports strong contrast with bright facet reflections. For practical use the stone's dimensions and proportionate depth make it well suited to conventional ring or pendant settings that allow light to enter the crown unobstructed, a well designed mount will preserve the open table and allow the mixed brilliant cut to perform optimally. At The Natural Sapphire Company we document origin, cut characteristics, clarity, and treatment so that the gem's optical behavior and provenance are fully understood, this sapphire represents a technically refined example of how material properties, careful cutting, and expert finishing converge to produce a blue sapphire whose sparkle is distinct and purposeful.