0.40 Ct. Ruby from Thailand

This transparent 0.40 carat round pinkish red ruby measures 4.31 x 4.26 x 2.39 mm, and is presented with a mixed brilliant cut, a clarity grade of slightly included when evaluated at eye level, vivid color intensity, excellent polish, and an enhancement through traditional heat treatment. Originating from Thailand, this stone exhibits a saturated pinkish red tone that remains even across the table and crown, an attribute enhanced by precise cutting and surface finishing. The slightly included clarity is limited at typical viewing distances and does not materially reduce the stone's overall transparency or its capacity to return light, while the excellent polish preserves crisp facet junctions and mirror like surfaces that are essential to consistent light performance. The Natural Ruby Company provides this ruby with full disclosure of origin and enhancement, reflecting a commitment to transparent sourcing and gemological accuracy.

The ruby s sparkle is a direct result of its corundum crystal structure, its optical constants, and the exacting facet architecture of the mixed brilliant cut. Corundum is an anisotropic mineral in a trigonal crystal system with a refractive index in the range of approximately 1.762 to 1.770 and modest birefringence near 0.008. These intrinsic properties create strong internal reflection and refraction of incident light. When combined with a mixed brilliant arrangement, which blends a faceted crown geometry optimized for light entry and scintillation with a modified pavilion that controls light return, the result is dynamic brilliance, lively scintillation, and well defined flashes of color. The excellent polish minimizes surface light loss, while the stone s modest depth and proportions maintain effective light return rather than excessive light leakage. Heat treatment has been used to stabilize and intensify the vivid hue, improving color uniformity without compromising the corundum lattice integrity. In practical terms this ruby s internal structure and skilled cutting produce bright, closely spaced flashes and a lively play of light that reads as an exceptional, clean sparkle in stones of this size, qualities that The Natural Ruby Company documents and stands behind in each selection.