1.02 Ct. Ruby from Tanzania

This transparent 1.02 carat cushion shape ruby measures 6.40 x 5.11 x 3.11 mm, and exhibits a vivid pinkish red hue with remarkable saturation. The gem has a mixed brilliant cut, combining a faceted crown and a pavilion designed to maximize light return, and it is graded very slightly included at eye level, indicating only minimal internal features that do not disrupt visual clarity. The polish is excellent, ensuring clean facet junctions and precise reflections, and the stone is free of any enhancement, preserving its natural optical character. Origin is Tanzania, a source known for producing rubies with lively color and well defined crystalline structure, and the stone presents consistent tone and color distribution across the table and crown facets.

The optical performance of this ruby is a function of its corundum crystal structure and the cutter s geometric proportions. Corundum has a relatively high refractive index, approximately 1.762 to 1.770, and a modest dispersion, which together generate strong internal reflection and controlled spectral separation. The mixed brilliant cut on this cushion form uses a shallow crown with carefully angled pavilion facets to create repeated internal reflections, producing scintillation that appears as pinpoint flashes and broad flashes depending on viewing angle and light source. The very slightly included clarity permits unobstructed light transmission through the pavilion, enhancing contrast between the bright flashes and the deeper color zones, while the excellent polish maintains crisp light return from each facet. Because the ruby has not been heat treated or otherwise enhanced, the interplay of natural color and facet geometry is unaltered, delivering a pure, lively sparkle that reads as both depth of color and lively brilliance. For those assessing structural and visual quality, this piece represents a balanced combination of natural material integrity, precision cutting, and surface finish, and it is offered by The Natural Ruby Company.