0.39 Ct. Bluish Green Sapphire from Madagascar

This transparent bluish green sapphire weighs 0.39 carat, and presents as a round shape with precise measurements of 4.49 x 4.48 x 2.72 millimeters. The stone is cut to a mixed brilliant specification, combining a brilliant style crown with a modified pavilion geometry to optimize both return of white light and controlled color display. Clarity has been evaluated as very slightly included at eye level, indicating that internal characteristics are minor and do not materially detract from light performance. Color is described as medium intensity, offering a balanced saturation that retains brightness without becoming overly dark. The piece has received a heat treatment enhancement, a standard and stable process for corundum that gently intensifies chromophore distribution. Origin is Madagascar, a source known for producing sapphires with appealing tone and lively color dynamics. The polish has been graded excellent, and the overall finish and symmetry adhere to demanding lapidary standards, ensuring consistent facet junctions and minimal surface scuffing.

The mixed brilliant cut architecture is the primary reason this sapphire exhibits a sparkle that stands apart from many others. The crown is faceted in a conventional brilliant arrangement, with star and bezel facets that act to break incoming light into numerous small beams, producing tight scintillation and a lively face up appearance. Beneath the girdle, the pavilion geometry departs from a simple brilliant pavilion, incorporating modified pavilion facets that favor controlled internal reflection and directional light return. The depth to average diameter ratio for this stone is approximately sixty one percent, a proportion that is intentionally chosen to maximize total internal reflection while avoiding excessive light leakage through the pavilion. Facet angles have been adjusted to complement corundum optical constants, specifically its relatively high refractive index, which requires slightly different pavilion angles than lower index gemstones to achieve ideal light return. Precise symmetry and well executed facet intersections minimize phase mismatch and unwanted stray light, so each facet functions as part of an integrated optical system rather than as an isolated mirror. The result is a uniform and energetic brightness across the table, with scintillation patterns that respond to movement and light source.

Beyond cut, the intrinsic optical and crystallographic properties of corundum amplify the effect of the lapidary design. Corundum has a high refractive index, and moderate dispersion, which together enable strong white light reflection with restrained spectral separation, so the sapphire exhibits bright flashes without excessive rainbowed fire that can appear at odds with the stone s inherent color. The material also displays pleochroism, and in a bluish green material this manifests as shifts between blue and green tones when the stone is tilted, adding dynamic color variation that enhances perceived sparkle. Very slightly included clarity at eye level means that most internal features are either microscopic or positioned so they do not interrupt key optical pathways. In some instances minor inclusions can contribute to localized reflectivity, creating micro highlights that add to the overall scintillation without compromising transparency. Heat treatment has been conducted to improve chromophore homogenization and to reduce the visual impact of minor zoning, a process that is stable and widely accepted in the trade, especially when performed under controlled conditions. Excellent polish reduces surface scattering, which preserves specular reflection from facet planes and allows the internal brilliance engineered into the cut to be fully expressed.

Craftsmanship and provenance combine in this gem to make it particularly well suited to fine jewelry applications where optical performance is a priority. The round mixed brilliant form is inherently versatile, and the slightly shallower than deep yet well balanced depth confers both visual spread and efficient light return when set in ring or stud designs. Settings that expose the pavilion to ambient light, such as open basket or low bezel configurations, will allow the pavilion facet architecture to interact fully with light sources, enhancing the lively scintillation and the subtle pleochroic color shifts that are characteristic of this material. Given the hardness and durability of corundum, everyday wear is practical, and the excellent polish will extend the period before repolishing is necessary, provided basic care such as removal during harsh mechanical activity is followed. The Natural Sapphire Company offers this sapphire with full disclosure of treatment and origin, and our lapidary quality control ensures that the exact proportions and finish described are maintained. For buyers who prioritize technical excellence and optical performance, this 0.39 carat bluish green round mixed brilliant sapphire presents a rare combination of careful cutting, favorable proportions, stable enhancement, and Madagascar provenance, delivering a sparkle that is measured in controlled light return and perceived brilliance rather than in accidental flashes.