7.89 Ct. Purple Spinel from Burma (Myanmar)

This 7.89 carat cushion shape purple spinel from Burma offered by The Natural Gemstone Company is a study in proportion and optical performance, presented in dimensions of 11.76 x 9.80 x 8.13 millimeters, faceted with a mixed brilliant cutting style, clarity grade very very slightly included evaluated at eye level, intense color intensity, and an excellent polish. The mixed brilliant construction combines a brilliant facet schema on the crown with a carefully graded pavilion, the result being controlled light return with sustained scintillation across the table and shoulders, and a face up saturation that reads rich without appearing overly dark. The cushion outline moderates the overall dispersion of light, creating broad flashes on the larger facets and lively pinfire on the corners, while the excellent polish produces crisp facet junctions and mirror like facet planes that maximize internal reflection. Heat treatment has been applied to stabilize and enhance the purple saturation, a common and stable enhancement for spinel that preserves the gemological integrity and produces a durable, long lasting hue. Burmese origin contributes to the desirability of this piece, as classic Myanmar spinel typically exhibits the depth and clarity that discerning collectors seek.

From a strictly optical and gemological perspective this spinel behaves in ways that differ meaningfully from corundum type gems such as ruby and sapphire. Spinel is isotropic and singly refractive, with a refractive index range centered near 1.712 to 1.718, and a modest dispersion near 0.018, which produces restrained fire but excellent overall brilliance when cut with mixed brilliant geometry. The isotropic crystal structure eliminates birefringence and pleochroism, so the purple hue presents uniformly as the stone is rotated under light, in contrast to corundum which can show uniaxial birefringence and pleochroic color shifts. Compared to garnet types that may sit at higher refractive indices and thus deliver stronger light return, spinel offers a cleaner, more even reflective field, with reflections that are less prone to dark windows or color zoning. Compared to tourmaline family stones that often show marked pleochroism and require careful orientation to maximize face up color, this spinel benefits from consistent color performance regardless of orientation. The mixed brilliant cut adopted here deliberately balances pavilion depth and table area to optimize both strong face up color and efficient light return, and the measured depth ratio of the 8.13 millimeter depth relative to the average length width yields a deep but controlled profile that preserves both color saturation and lively scintillation.

When you compare reflective qualities among stones within the same collectible cohort, this Burmese purple spinel occupies a space defined by uniformity and clarity of reflection, as well as by a compact, saturated face up color. Its reflective signature is characterized by broad, evenly distributed flashes interspersed with fine scintillation, and by high contrast between bright and dark facets due to the precise facet geometry and excellent polish. Corundum counterparts can show stronger contrast driven by higher refractive index, but they may also produce subtle color shifts under directional lighting, a variable that collectors may or may not favor. Garnets can sometimes appear more brilliant in certain lighting due to higher refractive indices, but they frequently carry a denser, heavier appearance, whereas this spinel reads more lively and elegant. Practical considerations include hardness and wearability, spinel being a durable eight on the Mohs scale, suitable for everyday set pieces, with the stable heat treatment ensuring long term color retention. For settings that emphasize reflective performance, an open crown design with minimal bezel and well placed prongs will allow maximum light exchange, letting the mixed brilliant pavilion and excellent polish demonstrate their full optical potential. The Natural Gemstone Company offers this Burmese cushion spinel as a precise example of skilled cutting and classic origin provenance, an option for buyers who favor consistent, intense color, clean optical behavior, and a refined interplay of brilliance and scintillation.