2.07 Ct. Bi Color / Parti Sapphire from Ceylon (Sri Lanka)

This 2.07 carat transparent, bi color parti sapphire from Ceylon is presented in a classical emerald cut, with dimensions 8.44 by 5.38 by 4.18 mm, faceted to emphasize linear color zoning and controlled light return. The cutting style employs stepped pavilion and crown facets with truncated corners, creating broad, mirror like facet planes that yield large, directional flashes rather than dispersed scintillation. Clarity is graded eye clean at eye level, and polish is excellent, so facet junctions are sharp and internal light paths remain unobstructed. Color intensity is described as intense, and because the stone has received no enhancement, the observed bi color effect is intrinsic to the crystal, showing distinct blue and greenish tones across the crown as the stone is tilted. The Natural Sapphire Company presents this specimen as a precision cut example where the cutter prioritized color distribution and face up saturation, producing a stone that reads as richly colored while retaining transparency and clarity.

From an optical and material science perspective this sapphire behaves like corundum with a refractive index in the range expected for natural sapphires, and a low birefringence that moderates double image effects while preserving pleochroic color shifts. The emerald cut, with its large table and stepped facets, reduces the amount of light diffusion and maximizes broad color windows, so the observer perceives deeper, more uniform color planes rather than the dispersed brilliance associated with mixed or brilliant cuts. Excellent polish increases total internal reflection at facet boundaries, enhancing return of wavelength selective light and strengthening the perception of color saturation. Because the stone is eye clean, internal scattering centers such as silk inclusions are minimal, which prevents diffusion of light and allows crisp delineation of the bi color zones. Practical mounting considerations follow from these attributes, as orienting the length of the emerald cut parallel to the viewer will emphasize the linear color banding, while a bezel or low profile prong setting will preserve contrast and protect the step facets without compromising the controlled flashes that define the cut.

Compared to other gemstones and cutting styles in this category, the reflective qualities of this emerald cut parti sapphire are deliberately different from the high scintillation seen in brilliant cuts. A round or cushion mixed cut sapphire with many small pavilion facets will yield more sparkle and rapid scintillation but will tend to break up color into smaller flashes, potentially diluting the visual impact of a bi color zoning. Spinel, which is often compared to sapphire for color, has a slightly lower refractive index and thus presents marginally softer brilliance for equivalent polish, so this sapphire will typically appear a touch more lively at equivalent facet quality. Zircon exhibits stronger dispersion and fire, but it is also softer and prone to wear, making its bright flashes less durable over time when compared to corundum, which ranks nine on the Mohs hardness scale. Diamond remains in a separate class with a much higher refractive index and dispersion, producing superior brilliance and fire, yet diamonds do not display pleochroic color phenomena and therefore cannot replicate the directional color interplay that defines parti sapphires. Within the family of Ceylon sapphires, stones from Sri Lanka are known for their vibrant, often velvety color, and this particular emerald cut bi color example accentuates that regional character by offering strong, directional color contrast with restrained but precise light return. For collectors and connoisseurs who prioritize controlled color presentation, durable polish, and natural, untreated origin, this sapphire from The Natural Sapphire Company presents a technically refined balance of optical properties and expert cutting.