0.97 Ct. Bluish Green Sapphire from Montana

This 0.97 carat round bluish green sapphire from Montana is presented by The Natural Sapphire Company as a precision cut main gem for bespoke jewellery. The stone measures 5.70 by 5.62 by 3.80 mm, yielding a depth of approximately 67 percent relative to the average diameter, a proportion that favors strong color saturation without sacrificing return. The cutting style is a mixed brilliant, combining a faceted brilliant style crown with a complementary pavilion design that controls light leakage and enhances both scintillation and color saturation. The faceting arrangement emphasizes a well defined table and an articulated crown that disperses light while the pavilion facets are calibrated to redirect light back through the crown, producing balanced brilliance and contrast. Clarity at eye level is graded very slightly included, which in practical terms renders the gem visually clean to unaided observation, while micrometric inclusions can be used by a lapidary to create interesting light interactions. The polish is excellent, giving crisp facet junctions and strong facet crispness that optimize both lustre and light return. Enhancement through heat treatment has been applied to stabilize tone and intensify the bluish green hue, a standard and durable practice for Montana sapphires, and the documented origin of Montana contributes to a distinct regional character in tone and hue distribution.

Colour characterization is technical and nuanced, the stone displays an intense color intensity with a bluish green axis that can read teal in diffused light and a deeper green in direct illumination. The mixed brilliant architecture allows the crown facets to showcase the stone s inherent hue and saturation, while the pavilion design mitigates windowing and preserves depth of color. Trace element chemistry typical of Montana sources, principally iron with variable titanium, contributes to the observed bluish green tone and a modest pleochroic response that can present slightly different blue and green vectors as the stone or the observer moves. Under warm incandescent light the sapphire tends toward richer green notes, whereas under daylight or LED illumination the blue component becomes more pronounced, giving the gem a versatile and dynamic appearance. Heat treatment has been applied to achieve an even distribution of color and to reduce zoning, while excellent polish ensures that the gem s surface interactions with light remain unobstructed, maximizing both brilliance and the subtleties of hue. For collectors and connoisseurs seeking a natural yet enhanced sapphire, this stone offers an appealing balance of documented origin, controlled treatment, and precision cutting that preserves the regional character.

Customization potential is broad, because the round mixed brilliant profile integrates cleanly into a wide range of settings and mounting philosophies. For a classic engagement ring, a four or six prong head will elevate and secure the stone while allowing maximum table exposure and fire, whereas a low profile bezel will protect the girdle and suit a lifestyle oriented client, with bezel lip geometry adapted to the stone s exact girdle thickness during setting. The mixed cut also adapts well to halo configurations, where a ring of melee diamonds or blue green sapphires can be calibrated in size and color temperature to enhance perceived saturation, or to a three stone composition where matched side stones can be faceted to either mirror or contrast the central hue. For modern alternatives, tension style settings and flush mountings are viable, subject to pre setting evaluation of girdle integrity and seat geometry by our master setters, and The Natural Sapphire Company offers CAD rendering and wax prototypes to ensure optimal profile and clearance. Choice of metal will materially affect perceived color, white metals will accentuate the blue component and increase apparent brightness, yellow gold will warm the green tones and create vintage contrast, and rose gold will soften the overall presentation. Additional technical options include knife edge prongs for a delicate silhouette, cathedral shoulders for elevation and presence, micro pavé for integrated sparkle, and hand engraved or millgrain detailing for textural contrast. Our workshop can tailor prong thickness, bezel wall dimensions, seat angles and locking pin locations, and provide gemological documentation on request, ensuring the finished piece combines secure mechanical engineering with the optical and aesthetic goals of the client.