1.66 Ct. Purple Spinel from Tanzania

This 1.66 carat cushion shape purple spinel, with exact dimensions of 7.65 x 6.30 x 4.26 mm, presents a studied balance between weight retention and optical performance. The transparent body, graded as slightly included at eye level, allows for consistent light transmission, yielding an even table facet and a lively inner scintillation. Color is classified as medium intensity purple, occupying a cool violet hue that reads neither pastel nor deeply saturated, and remains stable under a range of light sources. The cut is a mixed brilliant style, with a faceted crown carrying classic brilliant facet geometry to maximize sparkle, paired with a modified pavilion designed to preserve weight while optimizing light return. Polish is excellent across all facets, the girdle maintains a consistent thickness to facilitate secure setting choices, and there is no indication of enhancement, the crystal remaining wholly natural and untreated, provenance noted as Tanzania. Physically, the spinel exhibits the expected properties of the species, including a refractive index in the higher range typical for spinel family materials, minimal birefringence, a specific gravity consistent with natural spinel, and a hardness of 8 on the Mohs scale, ensuring durability for everyday wear when properly set.

The lapidary choices that produced this gemstone are deliberate and technically informed. During preforming the rough was oriented to align the table plane with the crystal habit that best transmitted the purple hue, avoiding orientations that would deepen color unevenly or trap optical obstructions. The mixed brilliant solution was selected to marry the brilliancy of a modern brilliant crown with a pavilion that maintains depth proportion relative to the 4.26 mm thickness, this proportion was chosen to manage return angles and to broaden the face up appearance without unduly sacrificing carat weight. Facet junctions are tight and symmetric, each pavilion keel is calibrated to reflect within the optimal range for spinel refractive behavior, and the overall facet architecture produces clean contrast between bright and dark zones, contributing to perceptible scintillation and table reflection. Slight inclusions, identified and mapped during cutting, were either minimized or positioned under facet junctions where they have minimal impact on face up appearance, the result being a gem that reads visually clean to the unaided eye while retaining natural character under magnification. The excellent polish enhances surface luster and facilitates precise light entry and exit, a keystone for a stone cut to exhibit the inherent brilliance of spinel.

The journey from Tanzanian deposit to market ready gem traces a sequence of artisanal and technical stages, each overseen with provenance and quality in mind by The Natural Gemstone Company. Initial extraction was by small scale teams working known spinel bearing horizons in Tanzania, where rough parcels undergo primary washing and hand sorting to segregate gem quality fragments from matrix and lower grade material. After initial sorting the selected rough piece for this gem was inventoried and transported under secure chain of custody to an independent lapidary partner, where a technical analysis determined orientation, ideal yield, and the decision to maintain a mixed brilliant profile. During cutting, the cutter applied incremental laps and precision faceting equipment, using a graduated sequence of abrasives to refine facet planes, followed by successive polishing laps to achieve the excellent polish grade. Quality control at The Natural Gemstone Company included independent visual clarity grading at eye level, color assessment under standardized lighting, and verification of the absence of enhancement through both gemological observation and trusted supplier attestations. Photography and hand model imaging were then produced to convey scale, tone, and sparkle to the final buyer, with measured dimensions and carat weight confirmed, and a recommended setting protocol provided to minimize exposure of the girdle and secure the stone in a profile that maximizes face up color. The result is a single, distinct 1.66 carat cushion spinel that blends natural Tanzanian character with precise lapidary execution, ready for connoisseurs who prioritize technical excellence and documented origin.