0.36 Ct. Greenish Blue Sapphire from Montana

This transparent greenish blue sapphire weighs 0.36 carat, and measures 3.80 by 3.77 by 2.73 mm. The stone is cut in an asscher octagon shape, exhibiting the square outline with clipped corners that defines the asscher style while retaining the optical geometry of an octagon. The color is described as greenish blue with medium color intensity, providing a balanced saturation that is neither overly pale nor deeply saturated. Clarity is graded as very slightly included, evaluated at eye level, and the gem displays a level of transparency that allows light to pass freely through the pavilion. The finish is an excellent polish, and the stone has been heat treated, a standard and stable enhancement used to enhance color and clarity. The origin of the sapphire is Montana, a provenance noted for producing sapphires with cool tones and distinctive green blue nuances, and The Natural Sapphire Company provides this stone with full disclosure of its attributes.

The asscher cut employed on this gem emphasizes step cut planes and concentric square facets that create a layered visual effect, often described as a hall of mirrors. With the dimensions provided, the cutter has optimized pavilion depth and table proportions to achieve a pleasing balance between brilliance and the broad flashes characteristic of step cuts. The faceting pattern produces defined, mirror like facets that reflect light in larger, geometric flashes rather than in the fine scintillation typical of brilliant cuts. The excellent polish contributes to crisp facet junctions and minimal surface haze, enhancing overall light performance. The clarity grade of very slightly included, observed at eye level, indicates inclusions that are minimal and not distracting to the naked eye, and because the stone is relatively small, these features do not impinge on the strong facet reflections or the clean window of the table.

The optical behavior of this greenish blue sapphire varies in predictable and attractive ways under different lighting conditions. In cool daylight and cool white LED lighting, the stone presents a crisp blue appearance with a subtle green undertone, the medium color intensity allowing both the blue hue and greenish nuance to be visible. The step cut facets respond to directional daylight by producing broad, parallel flashes that move with the wearer, giving a refined, architectural appearance to the light return. Under warm incandescent lighting, the stone leans slightly toward its green tonal component, producing a softer teal or sea green impression, while the overall brilliance remains moderate due to the step cut geometry. In direct sun, the asscher facets can produce strong contrast between bright flashes and darker facet windows, highlighting the depth of the color and the transparency of the material, and the medium intensity prevents the stone from appearing overly dark while allowing richer tones to emerge.

In low light and evening conditions, including candlelight, the sapphire will show a deeper, more saturated tone, with the step facets emphasizing larger flashes of reflected light rather than rapid scintillation, and the polished facet planes will catch and reflect even small light sources. In mixed or fluorescent lighting environments, the balance of blue and green shifts subtly depending on the spectral content of the light source, but the overall character remains cool and restrained. Because the stone is heat treated, its color is stable under ordinary wear, and its transparency combined with the asscher arrangement makes it an excellent candidate for a setting that allows light to enter the pavilion, such as a prong mounting or a low bezel with open gallery. For metal choices, white metals like platinum or white gold will emphasize the cooler blue aspects of the color, while warmer metals like yellow gold will introduce a gentle contrast that can make the greenish notes appear warmer and more pronounced. The Natural Sapphire Company recommends consideration of a setting that showcases the table and step facets, to preserve the geometric appeal of the asscher cut and to maximize the stone's optical strengths.

This description is intended to provide an accurate, technical account of the gem so that a jewelry designer or informed client may assess suitability for a specific design. The combination of a 0.36 carat weight, precise proportions at 3.80 by 3.77 by 2.73 mm, very slightly included clarity, medium color intensity, and excellent polish results in a compact, refined stone with a distinctive cool green blue character and a dignified light behavior. The Montana origin contributes to the stone's specific hue profile, and the heat treatment is consistent with standard practices to enhance and stabilize color. For settings, solitaire designs that expose the pavilion, three stone compositions with white diamond accents to frame the cool tone, or modern bezel settings crafted to show the table are all viable options depending on the desired aesthetic and the way the wearer prefers the stone to interact with light. For further technical information, high resolution imagery, or advice on mounting options, contact The Natural Sapphire Company and a gem specialist will provide additional measured observations and recommendations.