0.77 Ct. Chrysoberyl from Tanzania

This specimen is a transparent 0.77 carat emerald cut greenish yellow chrysoberyl, with precise dimensions of 4.83 x 4.37 x 4.01 mm, cut in a classical step facet plan that emphasizes color and clarity. The cutting style is a rectangular emerald cut, with long crown and pavilion steps, broad table, and squared corners that provide controlled light return and crisp facet outlines. Clarity is graded as slightly included at eye level, which in a step cut will present as discreet localized features rather than pervasive cloudiness, and the color is a medium intensity greenish yellow that reads naturally across a range of lighting environments. The polish is excellent, facet junctions are sharp, and symmetry is well executed, all of which confirm a high standard of lapidary craftsmanship. There is no enhancement, the material is natural Tanzanian chrysoberyl, and The Natural Gemstone Company stands behind the provenance and cutting quality of this stone.

From a faceting and cut engineering perspective, the emerald cut chosen for this material is a deliberate technical decision that trades maximum scintillation for optimal color presentation and directional flash. Step faceting in chrysoberyl produces broad, mirror like facet reflections that allow observers to evaluate tone uniformity and pleochroic shifts clearly. The cutting retains efficient weight relative to rough geometry while maintaining pavilion depth sufficient to support strong inward reflection given chrysoberyl s refractive index. With excellent polish and precise facet alignment, the table plane and step facets create clean, high contrast flashes, and these broad flashes are particularly effective in medium intensity material, as they enhance perceived saturation without flooding the stone with excessive dispersion. The slight inclusions remain localized in a manner consistent with high quality natural chrysoberyl, and their presence in an emerald cut becomes part of the character without undermining the gem s overall visual integrity.

Optically, chrysoberyl is notable for an adamantine luster and a high refractive index, values for chrysoberyl commonly falling around 1.745 to 1.755. Birefringence is low, approximately 0.008, and dispersion is modest, near 0.014, which means the stone delivers strong brightness and crisp facet contrast while producing only restrained fire. Compared to other gemstones in the chrysoberyl family, the reflective character of this transparent greenish yellow example is distinct. Against alexandrite, which is prized for its dramatic color change, this material exhibits greater consistency in daylight color, with less dynamic spectral shift but superior steady state brilliance in a stationary viewing plane. Against cymophane and other chatoyant varieties, which create a narrow moving band of light, the present emerald cut specimen yields broad planar reflections rather than a band, allowing for consistent appraisal of hue and saturation. When compared to common beryls such as emerald and aquamarine, chrysoberyl displays higher refractive brilliance due to its elevated refractive index, producing crisper facet delineation and a more metallic, reflective sheen. Relative to corundum, sapphire has a similar refractive index range, but chrysoberyl s lower dispersion results in fewer spectral flashes, so the eye perceives stronger polished mirror like flashes and purer color without competing fire. In short, the reflective qualities sit between the high brilliance of high RI stones and the subdued sparkle of low dispersion gem materials, manifesting as bright, directional flash and a clean, adamantine surface appearance.

For a technically minded buyer, this 0.77 carat emerald cut greenish yellow chrysoberyl offers a combination of measured optical performance and exacting workmanship. The step cut highlights the gem s color and pleochroic character, which can be showcased in bezel or channel style settings that maintain broad facet exposure, or in open prong settings that permit maximum light interaction with the pavilion. Given the medium color intensity, consider settings in warm metals to complement the greenish yellow tonality. The slightly included clarity grade is consistent with natural, untreated chrysoberyl from Tanzanian sources, and those inclusions serve as diagnostic features confirming natural origin to trained observers. As with all fine chrysoberyl, routine care should avoid ultrasonics only when inclusions are extensive, and simple warm soapy water with a soft brush is sufficient for maintaining the excellent polish. This gem is presented and guaranteed by The Natural Gemstone Company, and it will suit collectors and connoisseurs who value precise faceting, documented provenance, and the restrained yet compelling reflective qualities that distinguish authenticated chrysoberyl from other gems in its class.