2.20 Ct. Bi Color / Parti Sapphire from Australia

This transparent 2.20 carat cushion shape bi color parti sapphire measures 8.16 by 7.10 by 4.25 millimeters, and is presented with a faceted mixed brilliant cut and an excellent polish. The clarity grade is recorded as very slightly included, based on an eye level evaluation. Color intensity is described as intense, displaying a clear partition of green and yellow tones across the pavilion and crown. This stone is natural, untreated, and unenhanced, and its documented origin is Australia. The Natural Sapphire Company places emphasis on these objective attributes to support accurate assessment and appropriate use in finished jewelry.

The mixed brilliant cutting style applied to this cushion sapphire is designed to optimize light return while preserving weight and color. The crown facets are arranged to create lively surface reflections, while the pavilion facets are proportioned to encourage internal return of light toward the observer. The excellent polish contributes to crisp facet junctions and high surface reflectivity, which together produce distinct flashes of light when the gem is tilted. Because the stone is very slightly included at eye level, internal features do not materially scatter light in a way that dulls brilliance, instead they are minor and do not interrupt the overall pattern of reflection and scintillation.

From an optical perspective corundum, the mineral species for sapphire, has a refractive index near 1.76 to 1.77 and a low dispersion around 0.018. These inherent physical properties yield a strong overall brilliance but limited fire in the sense of spectral dispersion, when compared to gems with higher dispersion. In the context of other sapphires, a bi color parti example such as this one presents a more complex reflective behavior than a single hue stone. The presence of distinctly different color zones and natural pleochroism produces directional contrast, meaning that the perceived balance of light and dark areas, and the apparent color, will change with viewing angle and lighting. That dynamic is an intrinsic aspect of parti sapphires, and it can enhance perceived depth and liveliness without increasing spectral fire.

Comparatively, other gemstones that are commonly considered in the same market category exhibit different reflective profiles. Blue sapphires with uniform color typically deliver steady, consistent light return and dark blue flashes associated with deep saturation. Spinel, with a refractive index near 1.71 and marginally lower density, tends to offer a slightly different luster and a crisp, even reflection that can appear cleaner due to typically higher clarity. Tourmaline, with a lower refractive index near 1.62 to 1.64, presents softer internal reflections and less pronounced brilliance under equivalent cutting precision. Because corundum sits higher on the refractive index scale than any of these except for certain denser gems, it generally produces more vivid contrast between bright facet reflections and darker windows. In the case of this Australian parti sapphire, the mixed brilliant cut harnesses that contrast to accentuate color separation and controlled flashes, rather than to maximize dispersion.

When considering practical application in jewelry design and setting, the reflective qualities of this sapphire support settings that allow light to enter and re exit the stone, for example open backed or semi open designs that permit light to interact across the color zones. The cushion outline combined with the mixed brilliant facet arrangement gives the gem a balance of broad, luminous flashes and smaller scintillating points, which can be tuned by the choice of metal color and surrounding stones. Because the stone is natural and unenhanced, its optical character is stable under normal wear and under varying lighting conditions, and the excellent polish will maintain surface reflections with standard care. The Natural Sapphire Company documents these specifications to assist designers and clients in predicting performance and in making informed choices about mounting and complementary gem selection.