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

This 0.40 carat oval spinel from Ceylon offered by The Natural Gemstone Company measures 5.09 by 4.07 by 2.72 millimeters, exhibiting a transparent body with a greyish blue hue and light color intensity. The cutting style is faceted with a mixed brilliant arrangement, integrating brilliant pavilion facets with a more step oriented crown. This combination maximizes return of light while maintaining color stability in a light toned material. Clarity is graded as very very slightly included at eye level, which means the stone reads clean to most viewers while retaining minor internal features under magnification that do not detract from face up appearance. The polish is excellent, and the piece is natural with no enhancements, a valuable attribute for connoisseurs who prioritize untreated provenance in Ceylon spinel. Proportions are balanced for the oval form, with a pavilion and crown relationship engineered to support strong light return and even color distribution across the table.

In reflective performance this greyish blue spinel shows the classic vitreous luster and lively brilliancy inherent to well cut spinel, with a crisp facet definition from the excellent polish. Compared to corundum in the sapphire family, spinel has a slightly lower refractive index, which produces a more restrained but very clean sparkle, tending toward a silky brilliance rather than the more scintillating flash of corundum. Against gemstones like topaz or zircon, spinel displays less dispersion or fire than zircon, which is strongly birefringent and highly dispersive, and it is more durable than topaz due to the higher hardness of spinel. Unlike doubly refractive gems, spinel is singly refractive, so faceting yields unified light return without the doubled facet images seen in some other species. The mixed brilliant cut here enhances contrast dynamics and perceived depth, offering more scintillation than a pure step cut while preserving color saturation better than an all brilliant style would for a light greyish blue material. For buyers seeking a refined, natural Ceylon spinel with predictable optical behavior, robust durability, and meticulous craftsmanship, this stone represents a technically sophisticated choice, and The Natural Gemstone Company is pleased to present it as part of a curated selection for discerning collectors and setters.