7.70 Ct. Bi Color Cabochon Sapphire from Ceylon (Sri Lanka)

This specimen is a 7.70 carat heart shape bi color sapphire, precisely measured at 12.00 by 13.39 by 5.02 millimeters, presented as a cabochon. The choice of a cabochon cut rather than a faceted pavilion reflects an intentional cutting strategy to emphasize color zoning and translucency, rather than maximize facet brilliance. The dome height at 5.02 millimeters provides sufficient curvature to create smooth color transitions across the heart silhouette, while the heart outline has been executed with careful symmetry to preserve weight and achieve visual balance. The cutting approach retained significant rough weight, demonstrating a priority on color distribution and a clean, uninterrupted heart profile, rather than aggressive weight loss that a complex faceted cut would have required. The polish quality is graded excellent, resulting in a glossy, glass like surface that enhances surface reflections and highlights the internal color dynamics without introducing polishing pits or significant surface abrasions.

Color is the defining technical attribute of this stone, classified with a medium color intensity and exhibiting a distinct bicolor pattern. One lobe presents a cool blue saturation, while the opposing lobe shows a paler green yellow tone, yielding a bilateral color zoning that runs roughly along the median of the heart. The cutter oriented the stone to exploit that natural color separation, producing a visually striking bipartition that reads as two complementary hues within a single cabochon plane. Because the sapphire is translucent rather than fully transparent, light transmission is diffused through the body, producing a softer, more painterly appearance of the bi color effect, which can shift slightly with viewing angle due to weak pleochroic tendencies common to corundum. The declared clarity is included at eye level, which in practical terms means internal features are observable without magnification. These inclusions are consistent with natural, untreated material, and they interact with the domed surface to create internal textures and subtle light scattering. The lack of enhancement is a critical specification. No heating or diffusion treatments were applied, so the color and inclusions are in their natural state, information that is particularly valuable to connoisseurs and collectors who prioritize provenance and the integrity of the gem.

From a craftsmanship and setting perspective this cabochon heart is adaptable to jewelry that highlights its bicolor orientation, and it benefits from settings designed to protect the cabochon crown while exposing the color split. A bezel setting provides edge protection and secures the heart shape without interrupting the dome, while a custom bezel with an open gallery can be engineered to allow light to enter the pavilion for greater translucency. Prong settings are possible, but they require careful prong placement to avoid masking the characteristic median color line and to prevent stress on the narrow heart cleft. Given the dimensions of 12.00 by 13.39 by 5.02 millimeters and the stone weight of 7.70 carats, scale of the mounting should be proportionate, typically suited to a prominent pendant or a statement ring where the bi color aesthetic can be oriented vertically, presenting both hues simultaneously. The origin is Ceylon Sri Lanka, a classic provenience with geological conditions that favor complex color zoning in corundum due to variable trace element incorporation during crystal growth. The Natural Sapphire Company offers this cabochon as an example of expert cutting choices that balance weight retention, color presentation, and surface finish, and we can provide bespoke mounting options as well as independent verification of the no enhancement statement for collectors who require laboratory confirmation.