0.84 Ct. Spinel from Ceylon (Sri Lanka)

This transparent blue spinel is presented as a 0.84 carat, cushion shape gem, measuring 6.33 by 5.20 by 2.89 millimeters, offered by The Natural Gemstone Company. The stone has been fashioned with a mixed brilliant cut, combining a faceted crown and pavilion that favor both brilliance and depth. Its clarity grade is very very slightly included when evaluated at eye level, indicating that the internal features are minimal and do not interrupt the visual flow of light. The blue shows a medium intense saturation which balances vivid color with attractive brightness. The polish is graded excellent, and the stone is natural with no enhancement, originating from Ceylon Sri Lanka. Those objective details establish the foundation for how this spinel performs in jewelry, and they also frame the technical reasons behind its distinctive sparkle and presence.

At the material level, spinel belongs to the isometric crystal system, a structural arrangement that produces isotropic optical behavior. Because the crystal lattice treats light uniformly in all directions, this spinel does not display double refraction, which allows light to interact cleanly with each facet without the complication of directional contrast that occurs in anisotropic gems. The result is a clear, consistent transmission and return of light. Additionally, spinel possesses a refractive index that is moderate to high among gem materials. This refractive property reduces the critical angle for total internal reflection within the pavilion, so more rays are reflected back through the crown facets rather than escaping through the pavilion. The combination of isotropy and favorable refractive index gives spinel a strong, even internal return of light, which reads to the eye as a steady and lively brilliance across the crown surface.

The mixed brilliant cut of this cushion shape is the deliberate execution that transforms the intrinsic optical potential of the spinel into visible sparkle. The cutter has executed a pattern that pairs brilliant style facets on the crown with more controlled angled facets on the pavilion, creating numerous small light return facets that produce scintillation, contrasted by clean, open windows that reveal the stone depth and color. When light enters the crown it is refracted and then redirected by the precise geometry of the pavilion facets, undergoing multiple internal reflections before exiting. Each facet junction acts as a mirror and a lens concurrently, and the excellent polish ensures those surfaces behave predictably and without loss. The relatively shallow to moderate depth suggested by the 2.89 millimeter profile in a cushion form helps balance the path length of light so that flashes of white brilliance and colored fire are coordinated rather than washed out. Precision of table size, crown angles, and pavilion symmetry amplifies contrast, giving each movement of the hand an immediate and satisfying sequence of bright flashes and darker contrast areas, a signature of well cut mixed brilliant spinel.

Clarity, color, and origin further accentuate the gem performance in practical wear. The very very slightly included grade at eye level means the clarity does not interfere with facet to facet light return, so scintillation remains uninterrupted. The medium intense blue color from Ceylon Sri Lanka is evenly distributed, so absorption of specific wavelengths enhances saturation without starving the stone of returnable light. Because the gem is not subjected to any enhancement, the color and optical behavior are wholly natural, which allows accurate prediction of how the stone will present in a variety of settings and lighting environments. In hand the gem demonstrates resilience and polish retention consistent with spinel being a hard material, suitable for ring use as shown in supporting images. The Natural Gemstone Company sources and reports these technical attributes plainly to support informed decisions about design, mounting, and expected optical performance. For care, avoid harsh mechanical abrasion and persistent high heat or chemicals, simple cleaning with mild detergent and warm water preserves the excellent polish and ensures the structural factors that create its unmatched sparkle remain intact over years of wear.