1.56 Ct. Yellowish Green Chrysoberyl from Tanzania

This 1.56 carat yellowish green chrysoberyl from Tanzania exemplifies precise lapidary control and natural gem material integrity provided by The Natural Gemstone Company. Cut into a classic emerald cut with truncated corners and well aligned step facets, the stone measures 7.36 by 5.94 by 3.74 millimeters, yielding a length to width ratio of approximately 1.24 and a depth percentage of about 56.2 percent. The emerald cut was selected to emphasize the gemology of chrysoberyl, its intense color intensity, and its very slightly included clarity as evaluated at eye level. The step faceting produces parallel light corridors across the table and pavilion, creating a hall of mirrors effect that reinforces the yellowish green saturation while preserving transparency. Facet junctions are crisp, symmetry is well centered, and the polish is excellent, which together maximize light return and surface lustre without the need for any enhancement. The stone is unheated and untreated, its optical properties consistent with chrysoberyl, including refractive indices in the range of about 1.743 to 1.754, birefringence near 0.011, specific gravity around 3.73 to 3.78, and a hardness of 8.5 on the Mohs scale, making it exceptionally durable for fine jewelry settings.

The narrative of formation for this Tanzanian chrysoberyl begins deep within high grade metamorphic and pegmatitic environments where aluminum rich fluids interacted with iron trace elements under elevated temperature and pressure conditions millions of years ago. Crystallization occurred slowly in pockets and fractures, allowing the orthorhombic chrysoberyl lattice to develop compact prismatic crystals, and permitting iron substitutions to impart the yellowish green hue rather than the chromium induced color change seen in alexandrite varieties. Subsequent tectonic uplift and erosional processes liberated crystals into alluvial deposits from which skilled gemologists recovered a clean, transparent crystal. The cutter then evaluated the rough for optimal orientation of the pleochroic axis, orienting the emerald cut to balance color saturation and light performance, preserving weight while achieving excellent polish and facet symmetry. The result is a transparent, intense yellowish green chrysoberyl with minimal eye level inclusions, a well proportioned emerald cut, and the geological provenance and craftsmanship standards that define offerings from The Natural Gemstone Company.