1.51 Ct. Bluish Green Sapphire from Montana

This transparent 1.51 carat oval bluish green sapphire presents a precise balance of weight and spread, with dimensions of 7.95 millimeters by 5.96 millimeters by 4.02 millimeters, and a depth that measures approximately fifty seven point eight percent of the average diameter. The length to width ratio is approximately one point three three, giving the stone a slightly elongated, elegant profile that works well in both single stone and halo designs. The gem has been executed in a mixed brilliant cut, combining a brilliant style crown with a modified pavilion geometry to maximize return of light while preserving color saturation. Clarity is evaluated as eye clean at normal viewing distance, which allows unobstructed light transmission through the pavilion and crown facets, and the polish is graded excellent, yielding crisp facet junctions and lively scintillation. The sapphire is untreated, with no heat treatment or diffusion, and comes from Montana, a source known for producing bluish green and teal tones in corundum, adding an element of provenance that collectors and connoisseurs value. The Natural Sapphire Company offers this stone as a natural, responsibly sourced example of Montana corundum, ready for precision setting or bespoke design work.

The mixed brilliant faceting strategy used on this oval optimizes both brilliance and color performance, by concentrating smaller crown facets around the table to disperse light into defined flashes, while the pavilion architecture channels light back through the crown for perceived depth and life. The excellent polish enhances contrast between light and dark facet planes, improving the face up appearance and making the stone appear more lively under a variety of lighting conditions. Because this sapphire is transparent and eye clean, there is minimal internal obstruction to interrupt the passage of light, which is especially beneficial for mixed brilliant cuts that rely on uninterrupted light paths. The gem is corundum, with the hardness and stability associated with that species, making it suitable for everyday jewelry with appropriate setting protection. The natural pleochroism typical of sapphire can be observed in many stones from Montana, and this bluish green example may show subtle shifts between blue leaning and green leaning hues when viewed from different angles or under directional light, a trait that mixed brilliant cutting can display as attractive color movement.

Color is graded as medium intensity bluish green, a balanced saturation that reads neither washed nor overly deep, and because no enhancements have been applied, the color is the result of the stone chemistry and the host crystal environment. Medium intensity bluish green is highly versatile in matched styling, and it interacts with skin tone and setting metal in predictable ways. On cool fair skin with pink undertones, the blue aspect of the stone will be emphasized, and a white metal setting such as platinum or white gold will reinforce that cool character, producing a crisp, elegant combination. On fair skin with warm undertones, or on medium skin tones with golden or olive undertones, the green side of the hue will harmonize with warmer metals, and a yellow gold or rose gold mount will bring forward the green warmth, creating a more organic and integrated look. On medium to dark skin tones, the medium intensity saturates the field enough to provide a vivid presence without appearing opaque, and both yellow gold and white metal settings will provide effective contrast, with yellow gold yielding a stronger complementary effect and white metal delivering a cooler, more contemporary contrast. For wearers who prefer increased perceived saturation, a halo of small white diamonds will intensify the bluish green by contrast, whereas a warm colored accent stone will emphasize the green component.

Design and setting choices allow further modulation of the apparent color and performance. An open back or low profile prong setting prioritizes light entry and will display the stone with maximum face up brightness, which suits the mixed brilliant cut and the transparency of this gem. A bezel setting offers protective security for everyday wear and imparts a slightly darker perceived tone by controlling light leakage, an effect that can be used intentionally to moderate brilliance in a design that emphasizes depth of color. The length to width ratio and the millimeter dimensions make this sapphire an excellent candidate for solitaire engagement ring centers in sizes that suit a broad range of fingers, and the eye clean clarity supports clean pavé and channel work adjacent to the center stone, without risk of visible inclusion interruption. Given the natural origin and untreated status from Montana, clients concerned with natural provenance and material integrity will appreciate the documented absence of treatment, and The Natural Sapphire Company is prepared to provide full gemological details and high resolution imagery or video under controlled lighting to aid final design decisions. For bespoke settings, recommendations include selecting a metal that complements the desired visual emphasis, considering a halo to enhance apparent saturation, and employing secure prong geometry to preserve light performance while protecting the stone for daily wear.