3.04 Ct. Yellowish Green Sapphire from Ceylon (Sri Lanka)

This transparent 3.04 carat oval yellowish green sapphire from Ceylon Sri Lanka is presented with precise dimensions of 10.20 x 7.62 x 5.06 mm, a mixed brilliant cut, a clarity grade of very slightly included, evaluated at eye level, intense color intensity, and an excellent polish. The stone is natural with no enhancement, and its provenance and finishing are documented by The Natural Sapphire Company. The material is corundum, with an intrinsic refractive index in the range of 1.762 to 1.770, and a modest birefringence value around 0.008. These fundamental optical constants mean that corundum bends light strongly as it enters the gem and returns a large portion of that light through the crown when cut and polished with appropriate proportions. The mixed brilliant cut applied to this oval serves to translate those material properties into visible performance, by combining a faceting scheme that creates both broad flashes of light and fine scintillation. The stone is fully transparent, and the very slightly included clarity at eye level indicates that inclusions do not materially interrupt the primary light paths responsible for brilliance and scintillation.

The sparkle observed in this sapphire arises from an integrated set of structural and cutting factors, beginning with the corundum crystal lattice itself. Corundum’s dense, tightly bonded hexagonal lattice produces a high refractive index and a vitreous to slightly adamantine lustre, so each facet surface provides a strong interface for total internal reflection when facet angles are matched to the refractive index. In this example the pavilion depth of 5.06 mm and the oval outline yield a length to depth proportion of approximately two to one, a geometry that supports efficient return of light. The mixed brilliant cut uses a faceted crown with larger star and kite facets and a pavilion pattern that terminates in carefully aligned facets rather than a simple flat culet. Crown facets act as optical windows that scatter and refract returning rays into contrast and brilliance, while pavilion facets trap light and redirect it upward. The excellent polish minimizes microscopic surface diffusion and scattering, preserving sharp internal reflection and crisp facet junctions that produce pinpoint scintillation. Because the stone is natural and untreated, its internal microstructure interacts with light in an original way, so the balance of contrast and flash is wholly native to the material rather than imposed by thermal or chemical modification.

Beyond raw refractive performance, the gemstone’s internal anisotropy and natural color distribution contribute to a dynamic appearance that enhances perceived sparkle. Corundum is pleochroic, so this yellowish green example shows shifts between green and warm yellow tones depending on viewing angle and light polarization, producing lively color play as the wearer moves. Those color shifts create localized contrast between bright flashes and darker color zones, a form of chromatic scintillation that complements pure optical brilliance. The intense color intensity concentrates light absorption in the right spectral bands so that reflected light appears saturated and vivid rather than washed out, reinforcing the sensation of depth and fire. The combination of high refractive index, disciplined mixed brilliant facet architecture, minimal inclusion interference, and superior surface finish yields a sparkle that is distinguished among gemstones, a performance quality documented and supported by The Natural Sapphire Company. This sapphire’s structural attributes make it particularly well suited to settings where facet geometry and viewing orientation will be preserved, allowing its inherent optical properties to be experienced fully.