1.31 Ct. Greyish Blue Spinel from Ceylon (Sri Lanka)

This listing presents a transparent 1.31 carat cushion shaped spinel from Ceylon Sri Lanka, with precise dimensions of 6.39 x 6.10 x 4.04 mm, a light greyish blue hue, a mixed brilliant cut, and an excellent polish. The material is entirely natural, confirmed as unenhanced, which preserves the gemological integrity valued by discerning buyers. At The Natural Gemstone Company we prioritize provenance and treatment disclosure, and this specimen is an exemplar of Sri Lankan spinel character, combining a cool blue tone with subtle neutral grey undertones that allow it to read elegant under a broad range of lighting conditions. The weight to dimension relationship yields a comfortable spread for the carat size, producing a presence on the finger that is proportional and refined, while retaining the optical depth expected from a quality spinel.

The mixed brilliant faceting on this cushion shape has been executed to balance fire and windowing, by pairing a brilliant style crown with a modified pavilion architecture, which enhances facet junction contrast and produces controlled scintillation across the table. The cutter has maintained well centered symmetry, enabling even light return and presenting a pleasing pattern of broad flashes interlaced with smaller pinpoint scintillation as the stone moves. The pavilion depth at 4.04 mm contributes to a lively performance without excessive light leakage, and the excellent polish ensures minimal surface diffusion so that facet planes remain crisp and reflective. Observed inclusions are described as slightly included at eye level, which means that while minor internal features are present, they do not significantly disrupt the faceting pattern or diminish the stone s overall brilliance when mounted, and they serve as natural identifiers that affirm the gem s authenticity.

Color assessment registers as light in intensity, with a greyish blue saturation that is restrained rather than vivid, yielding a versatile aesthetic that complements both white and warm metals, and that performs particularly well in mixed metal and platinum settings where neutrality is desirable. This tonality is distinct from the saturated velvets of classic Ceylon sapphires, offering instead a softer blue with a silvery overlay that reads modern and understated. The lack of enhancement is a significant factor for collectors and for long term wear, because it means the color and clarity are intrinsic, thus stable under routine conditions. From an optical standpoint spinel s isotropic crystal system contributes to uniform color distribution and consistent light behavior across viewing angles, which is evident in this stone s even face up color and lack of pronounced pleochroic effects. The grey component tempers the blue, creating a stone that appears both contemporary and timeless, and which changes subtly with ambient light from a steely blue in daylight to a warmer slate blue under incandescent lighting.

For use as an engagement center the gem s physical properties and faceting make it an excellent candidate for daily wear, spinel s hardness of approximately Mohs 8 provides a durable surface resistant to everyday abrasion, and its stability against heat and common household chemicals gives added peace of mind for an enduring symbol. The cushion outline and mixed brilliant cut work exceptionally well in settings that emphasize the table and crown face up appearance, such as a four or six prong solitaire that secures the corners while maximizing light entry, or a low profile bezel with a polished inner rim to protect the girdle while maintaining a modern silhouette. Design considerations include a modest halo of fine melee to amplify perceived diameter without overwhelming the stone s subtle color, or a cathedral setting to introduce additional depth and vertical presence. The provided hand scale photographs demonstrate how a 6.39 mm cushion presents on typical finger proportions, showing a balanced look that neither dominates nor recedes, and offering clients a reliable reference for ring design and finger coverage.

At The Natural Gemstone Company we recommend that clients considering this spinel for an engagement piece request a tailored setting plan to optimize light performance and to accommodate the stone s slightly included clarity grade, for which we suggest secure prong placement and an open profile beneath the pavilion to preserve brilliance. Our team can advise on metal weight and prong geometry to ensure longevity and to minimize stress at the girdle, and we offer optional independent gemological reporting for buyers seeking additional documentation. This 1.31 carat Ceylon cushion spinel represents a sophisticated alternative to traditional blue gems, pairing gemstone integrity with thoughtful cutting and polish, and it will serve as a durable and visually distinctive center for an engagement ring that favors refined color, natural authenticity, and technical excellence.