0.39 Ct. Bi Color Sapphire from Montana

This transparent 0.39 carat round bi color sapphire is a compact and lively example of Montana gem material, offered by The Natural Sapphire Company. The stone measures 4.37 x 4.38 x 2.89 mm, and the proportions yield a depth that is well suited to the mixed brilliant cut, producing a balanced interaction between crown and pavilion facets. At 0.39 carat the gem is small enough to be used as a refined center in a delicate engagement ring, or as a striking accent in a three stone or cluster design, yet large enough to show its bi color character to the naked eye. The medium color intensity presents as golden yellow with pockets of cool blue, a distribution typical of parti and bi color sapphires from Montana, and the transparency of the crystal lets light traverse the stone and reveal subtle internal color zoning. The mixed brilliant cut clarifies the round outline and supports scintillation across the table, while the overall finish is recorded as excellent polish, assuring crisp facet junctions and minimal surface disturbances that could otherwise interfere with light return.

Clarity is graded as slightly included when evaluated at eye level, which to an experienced buyer means that the inclusions are present and visible on close inspection, yet they do not significantly compromise durability or the overall visual appeal of the gem. These slightly included characteristics are common in natural Montana sapphires and often serve as a fingerprint of natural origin, adding to the stone story rather than detracting from it. The clarity profile, combined with the gem s transparency, allows internal features to act as light scattering elements that can increase sparkle in certain lighting situations, provided the stone is cut with an eye to balancing facet angles. Heat treatment is disclosed, and that treatment is a stable, industry accepted enhancement used to intensify hue and reduce unwanted brown or gray overtones, while preserving the natural color zoning that defines parti and bi color stones. For an educated buyer, the presence of slight inclusions and a documented heat treatment are important considerations that are fully consistent with responsible sourcing and value assessment, and they align with The Natural Sapphire Company s commitment to transparent disclosure.

The mixed brilliant cut of this round sapphire is central to how the gem presents itself in the hand and on the finger, because the cut controls both light return and the visual emphasis of the bi color effect. A mixed brilliant typically combines a brilliant faceted crown with a modified or step pavilion, which concentrates dispersion and scintillation on the crown while allowing the pavilion to guide light back through the table in a way that can either blend or separate the stone s color zones. In this 0.39 carat stone the facet arrangement has been chosen to maximize the lively flashes of yellow and to reveal secondary blue areas without collapsing the contrast between them, producing a dynamic interplay of color as the gem moves under light. The moderately deep pavilion proportion helps retain brightness rather than leaking light through the sides, and the excellent polish ensures that every facet face reflects cleanly, amplifying fire and contrast. For setting, a low bezel or four prong mounting can be used to preserve the round silhouette while allowing the table to read as bright and saturated, and orienting the stone so that the table looks toward the most attractive distribution of color will make the piece visually arresting. Corundum s inherent hardness and toughness make this Montana bi color sapphire a durable choice for everyday wear, and its combination of natural origin, documented enhancement, transparent body, and deliberate mixed brilliant cutting make it an attractive purchase for collectors and connoisseurs seeking a distinctive, well documented gem from The Natural Sapphire Company.