0.39 Ct. Greenish Blue Sapphire from Madagascar

This 0.39 carat oval greenish blue sapphire measures 5.16 x 3.82 x 2.48 mm, and it presents as transparent with a light color intensity and a very very slightly included clarity grade when evaluated at eye level. The gem has been heat treated, a standard and stable enhancement for sapphires, and it originates from Madagascar, a source known for clean material with attractive pastel to medium tones. The cut is a mixed brilliant, executed to balance brilliance and color distribution within an elongated oval outline, and the polish on all facets has been evaluated as excellent, producing crisp facet junctions and bright return of light. This piece is offered by The Natural Sapphire Company, and the combination of its size, shape, and finishing makes it particularly suitable for delicate engagement rings or refined accent settings where optical performance and color nuance are both required.

The mixed brilliant cut is the core reason this sapphire’s sparkle is unmatched by many stones of similar size, because the faceting schema is engineered to optimize internal reflection for corundum, which has a relatively high refractive index. The crown presents a series of brilliant style facets that capture and refract incident light into a tightly controlled beam, while the pavilion is configured with a modified arrangement that maximizes total internal reflection back through the crown. The result is a dynamic interplay of brilliance and scintillation, with bright white flashes from specular reflection and lively pinpoints of light that move with the wearer, creating a perception of greater visual size. In addition, the oval outline concentrates light along the length of the stone, producing elongated flashes that enhance the greenish blue hue, and the careful symmetry of the facet pattern avoids light leakage through the girdle, preserving contrast and depth. Because corundum exhibits modest dispersion, the faceting emphasis is on return of white light, and in this specimen the strategic proportioning of table, crown height, and pavilion angles yields both a vivid lifelike sparkle and clear, clean color faces that allow the subtle greenish blue to be appreciated without being drowned by body tone.

Clarity and polish are equally decisive in how the stone performs, and the very very slightly included grade at eye level means that microscopic inclusions are present but do not interrupt the optical path or act as dead zones that scatter light. These minute features, often fine crystals or thin silk needles, can actually serve to break up broad flashes and create additional scintillation when they are few and well positioned, but in this sapphire their distribution is such that the overall return of light remains uninterrupted. The excellent polish amplifies this effect by minimizing surface scattering, so every facet edge acts as a precise mirror, sharpening contrast and increasing the intensity of reflected light. The heat treatment applied to this Madagascar sapphire has been controlled to stabilize the greenish blue tone and to reduce masking inclusions, thereby enhancing the gemstone’s translucency and allowing the mixed brilliant faceting to perform at its designed optical efficiency. When set in an open head mount that allows ample light to enter through the crown as well as reflective backing that returns light through the pavilion, this sapphire displays its best attributes, showing crisp faceted brilliance, lively scintillation, and a delicate, sea glass like tint that is both refined and visually compelling. The Natural Sapphire Company stands behind the provenance and craftsmanship of this gem, and we welcome inquiries for custom settings or technical details to ensure the stone is mounted in a way that maximizes its unmatched sparkle.