1.50 Ct. Bi Color / Parti Sapphire from Montana

This 1.50 carat oval shaped bi color or parti sapphire from Montana is an exceptional example of precision gem cutting and natural color expression, presented by The Natural Sapphire Company. The gem measures 7.05 by 5.74 by 4.57 millimeters, and is transparent with a medium color intensity that shifts between warm golden tones across the crown and cooler, more neutral tones toward the pavilion, presenting the classic parti sapphire character prized by connoisseurs. The piece is faceted using a mixed brilliant cutting philosophy, combining a modified brilliant crown with carefully proportioned pavilion facets to balance scintillation and overall light return, the polish is graded excellent, and the finish exhibits crisp facet junctions and a smooth girdle finish that support clean light transmission and minimal surface disruption.

From a cutting and faceting standpoint this stone demonstrates deliberate facet planning to optimize optical performance for its oval outline, the mixed brilliant style uses smaller, well defined crown facets to break light into vivid flashes, while the pavilion facet architecture is configured to return that light through the crown with minimal leakage. The crown presents a well proportioned table to crown ratio, promoting a lively balance between face up brightness and depth, and the pavilion depth of 4.57 millimeters allows the pavilion facets to act as a controlled conduit for internal reflections, maximizing perceived size. The cutter has executed facet angles and junctions to enhance the stone's brilliance and scintillation pattern, resulting in a lively spread of pinpoint and larger flashes that animate the face up presentation in varied lighting environments, the overall symmetry supports consistent light performance when the stone is oriented along its major and minor axes.

Color technicalities are central to this offering, the sapphire displays true parti color behavior with distinct but harmonious color zones, the medium intensity grading reflects a saturation that preserves transparency while delivering noticeable hue, the transition between hues is handled with controlled zoning rather than abrupt banding, which allows the stone to present different dominant tones depending on orientation, a factor many collectors use to design settings that either emphasize the warm golden side or the paler, cooler side. As a corundum material this sapphire exhibits pleochroism, and the cutter has considered pleochroic axes during orientation to deliver balanced color in face up view, the stone has been heat treated according to standard enhancement practices to optimize tone and clarity while retaining natural character, and The Natural Sapphire Company discloses this treatment in keeping with best practice for provenance and buyer information.

Clarity evaluation at eye level is described as slightly included, these internal features are present but do not substantially impede transparency or the sparkle produced by the cutting design, the inclusions are stable and compatible with secure jewelry setting, and the stone remains robust for daily wear when properly mounted. From a setting perspective the oval outline and measured proportions make this sapphire highly versatile, prong settings with four or six claws will display maximum table light, while a low bezel can offer contemporary protection with minimal impact on brilliance, in bespoke designs the parti nature invites creative orientation so that the dominant hue aligns with face up viewing preferences. The Natural Sapphire Company stands behind the documented origin of Montana and the disclosed heat treatment, and we recommend optional gemological reporting for collectors who require independent verification, this sapphire, with its engineered mixed brilliant cut, transparent body, excellent polish, and distinctive bi color character, is designed to function as a technical and aesthetic centerpiece in any collection, delivering measurable optical performance and the distinctive regional character that discriminating buyers seek.