3.66 Ct. Cabochon Chrysoberyl from Tanzania

Millions of years ago this greenish brown chrysoberyl began as invisible constituents in deep crustal rocks, locked within aluminum rich schists and pegmatitic bodies far below the Earths surface. Under sustained heat and pressure, and with the movement of beryllium bearing hydrothermal fluids, the elements necessary for chrysoberyl crystallization converged, allowing beryllium, aluminum, and oxygen to organize into stable aluminate structures. Slow cooling and episodic pulses of fluid flow favored the growth of well formed crystals, and subsequent tectonic uplift exposed these formations to weathering and erosion. Over extended geological time the liberated crystals were transported and concentrated by streams into placer deposits in Tanzania, where mechanical rounding and chemical alteration produced the translucent material valued today for its depth of tone and evenness of texture. The story of this stone is a record of deep Earth processes, a chronicle of heat, pressure, and fluid chemistry that unfolded over millions of years to yield a gem with both mineralogical integrity and visual presence.

This specimen is a translucent 3.66 carat oval shape greenish brown chrysoberyl, with dimensions of 8.79 x 6.54 x 6.48 mm, fashioned in a cabochon cut to emphasize its uniform color and internal character. The clarity has been evaluated at eye level as very very slightly included, indicating only minimal internal features that do not detract from the gem's overall appearance. Color intensity is described as intense, producing a rich greenish brown hue that reads consistently across the surface, and the piece has an excellent polish, providing a smooth reflective face and well defined dome. There has been no enhancement applied to this stone, and its stated origin is Tanzania, a region known for producing high quality chrysoberyl material. Offered by The Natural Gemstone Company, this gem is suitable for use in jewelry settings where a polished cabochon profile is desired, and its dimensions and weight provide clear parameters for mounting and design. The combination of geological provenance, intact crystal structure, and careful lapidary work results in a chrysoberyl that communicates its natural history while meeting exacting standards of cut, clarity, and finish.