0.83 Ct. Color Change Sapphire from Tanzania

This 0.83 carat cushion shape color change sapphire, measuring 5.25 by 4.57 by 3.71 millimeters, exemplifies purposeful geometric faceting designed to maximize light play. Cut to a mixed brilliant configuration, the cutting plan pairs a highly faceted, modified brilliant crown with a precision-arranged pavilion, producing a network of kite and triangular facets that optimize internal reflection and scintillation. The cushion outline and truncated corners increase the effective table area while the pavilion depth, approximately 75.5 percent of the average girdle diameter, concentrates light return into intense, saturated flash, enhancing the stone’s color saturation face-up. Facet junctions show strong symmetry and the excellent polish yields crisp facet reflections with minimal diffusion, enabling sharp caustics and lively contrast patterning when viewed under directional light. The mixed brilliant geometry deliberately balances brilliance and color saturation, preserving an open face-up appearance while maintaining deep, velvety color in repose.

Optically this Tanzanian sapphire displays a true color change, shifting between cooler blue-violet tones under fluorescent and daylight-equivalent lighting and warmer violet to purplish hues under incandescent illumination. The stone’s intense color intensity benefits from the cutter’s decision to retain depth and align pavilion facets to reinforce selective absorption, so the color change is pronounced without detracting from overall brilliance. Clarity is graded very very slightly included when evaluated at eye level, translating to a largely clean face-up presentation with only minor internal features that do not interrupt light performance. No enhancement has been applied, confirming a natural material with intact surface and subsurface integrity. For setting considerations, the mixed brilliant facet architecture and the stone’s pavilion depth respond well to open-profile prong or low-bezel mounts that allow light ingress from the girdle and pavilion facets, maximizing play-of-color and scintillation. The Natural Sapphire Company stands behind the gemological attributes of this sapphire, offering a specimen that combines meticulous cutting, excellent polish, strong geometric facet planning, and a distinctive, market-desirable color change from a reputable Tanzanian origin.