1.22 Ct. Bi Color Cabochon Sapphire from Montana

This offering from The Natural Sapphire Company is a carefully described one point two two carat round shape bi color sapphire, presented as a cabochon cut, with dimensions of 6.00 by 5.94 by 3.00 mm. The cabochon form is executed as a classic domed profile with a fully rounded crown and a flattened base, optimized to balance light return and color presentation in a semi translucent material. The cutting style emphasizes symmetry of outline and dome height, yielding a pleasing circular silhouette that preserves weight while minimizing windowing. The carat weight relative to the measurements indicates an efficient material yield from the rough, and the cabochon geometry allows the bi color zoning to read across the surface rather than being fragmented by faceting, which is particularly desirable for collectors and designers seeking to showcase natural color transitions rather than maximize sparkle.

Color is the defining element of this piece, described as bi color with light overall color intensity, showing a juxtaposition of yellow and bluish green tones across the dome. The semi translucency permits internal scattering and a soft diffusion of light, creating a luminous, watery effect rather than the bright brilliance associated with faceted stones. In corundum this kind of color zoning can be associated with variable trace element distribution, commonly iron and titanium, and in Montana material the pastel green to yellow palette is characteristic. The cabochon orientation appears to be chosen to emphasize a pleasing gradient, with the yellow component concentrated to one sector and the blue green to the opposing sector, producing a subtle bicolor display when rotated. Because corundum is dichroic, viewing direction can alter perceived hue and saturation, and the semi translucent nature of this specimen softens dichroic shifts into gentle color modulation rather than abrupt pleochroic flashes.

Clarity is graded as included, evaluated at eye level, which in a cabochon context reflects visible internal features that contribute to the gem character rather than detract from it. The images and the loupe level assessment indicate needle like and feather type inclusions and growth zoning, features typical of natural Montana sapphires, and these internal structures interact with transmitted light to enhance the stone’s internal patterning. Included clarity in a cabochon can create depth and a living texture that collectors often prize, and in this example the inclusions are well integrated with the color zoning, producing an organic aesthetic. The gem has undergone heat treatment, a standard and widely accepted enhancement for sapphires, executed to stabilize and sometimes subtly modify the color and clarity, without altering the gem’s structural identity as natural corundum. Heat treatment in this class of material typically reduces silk and enhances transparency marginally, and the current semi translucent appearance indicates a cautious heat application aimed at preserving the delicate bi color effect rather than homogenizing the hues.

Craftsmanship and finishing are evident in the excellent polish and the careful control of proportions and surface quality, important factors for a cabochon meant for immediate setting. The surface polish is clean and smooth, executed on fine laps to eliminate any lap marks or polish haze, which is essential to maximize the soft sheen and to allow unobstructed viewing of the internal color interplay. The dome is well centered and shows consistent curvature, which supports even bezel seating or low profile collet work, and the flattened base is appropriate for secure mounting without excessive removal of material. From a fabrication perspective, the stone is ideal for design approaches that leverage its round silhouette and bi color nature, for example a bezel set pendant where the dome is exposed to transmitted and reflected light, or a ring setting where the cabochon’s domed profile can be oriented to showcase the color gradient. Given the hardness of corundum, the stone will perform well in everyday jewelry when set with protective metalwork, while the inclusion grade and semi translucent body warrant settings that reduce exposure to harsh knocks.

Provenance and technical summary are important for informed buyers, the object being a Montana origin natural sapphire with a documented enhancement of heat treatment, weighing one point two two carats and measuring 6.00 by 5.94 by 3.00 mm, with a cabochon cut, semi translucent body, included clarity at eye level, light color intensity, and excellent polish. The Natural Sapphire Company presents this gem for clients who appreciate the lapidary decisions made to retain natural zoning and character, and for designers seeking a stone whose internal texture and bi color presentation will respond dynamically to orientation and light. For those who require further gemological confirmation we can provide additional imaging under directional light and microscopic documentation of inclusion types and distribution, and we can advise on ideal mounting strategies to preserve the cabochon profile and to maximize the visual impact of the bi color phenomenon.