1.83 Ct. Greenish Blue Cabochon Sapphire from Montana

This 1.83 carat greenish blue sapphire presents as a beautifully balanced example of what makes cabochon cut sapphires so compelling. Measuring 6.11 by 6.15 by 4.24 millimeters, the round cabochon form emphasizes the stone’s semi translucent character, allowing light to interact with the body color in a way that faceting cannot replicate. The medium intense color intensity yields a pleasing saturation where both the blue and subtle green components are visible, producing a complex and attractive tone that reads as fresh and natural to the eye. Graded as slightly included at eye level, the clarity remains strong for a cabochon, with inclusions that are detectable under close inspection yet do not dominate the gem or obscure its color. An excellent polish enhances the smooth dome and produces a soft luster across the surface, which complements the cabochon’s gentle play of light. The combination of size, weight, and well controlled proportions at 1.83 carats and the precise millimeter measurements make this stone highly wearable, offering presence without overwhelming delicate settings.

Understanding treatments and the gemological context is essential in evaluating value, and this sapphire has been heat treated, a widely accepted and stable enhancement in the trade. Heating is used to improve color uniformity and to reduce the visibility of some internal features, and when performed properly it does not compromise the structural integrity of the corundum. The slightly included clarity grade should be viewed alongside the treatment disclosure, because many connoisseurs appreciate the natural characteristics that remain visible after treatment, as they testify to the gem’s natural formation. The greenish blue hue of this sapphire is a result of trace element chemistry within the corundum, principally iron in combination with titanium, and the medium intensity of the color speaks to a balance between saturation and brightness that appeals to educated buyers seeking stones that are visually appealing yet not overstated. The cabochon format is particularly well suited to semi translucent material, as it concentrates color and glow, creating a gem that reads deeply colored under varied lighting while retaining subtlety when viewed up close.

The origin of this sapphire in Montana adds an important layer of significance and value that educated purchasers recognize and often prize. Montana sapphires have a documented history of producing stones with a distinctive palette, frequently including delicate blues, teals, and greenish blues that differ meaningfully from the more saturated, electric blues of certain Asian deposits. The geology of Montana yields sapphires with nuanced chroma and often with internal character that speaks to their natural formation in alluvial and host rock environments. Provenance from Montana can carry a premium because it connects the gem to a well known North American source with a tradition of small scale, traceable mining, and because collectors and designers value the regional signature that these stones exhibit. In the marketplace, provenance matters for both aesthetic and ethical reasons, and a Montana origin signals a particular story which enhances desirability among buyers who prioritize traceability, geological interest, and a distinctive, place based character in their gems.

For practical use and long term enjoyment this sapphire is an excellent choice. With a Mohs hardness of 9, corundum is durable enough for everyday wear, and the cabochon shape sits securely in bezel or low profile settings which also complement the stone’s smooth domed surface. The combination of medium intense greenish blue color, excellent polish, and slightly included clarity yields a gem that photographs beautifully, performs well under varied lighting, and adapts to contemporary or vintage inspired designs. Cleaning is straightforward, with warm soapy water and a soft brush recommended for routine care, and professional inspection advised if the stone is set in a frequently worn piece. Because heat treatment is disclosed, buyers can make informed comparisons to untreated material, understanding that this enhancement is standard and stable. At The Natural Sapphire Company we provide full disclosure of origin and treatments, and we support each gem with detailed measurements and evaluation so that buyers can assess quality with confidence. If you would like additional imagery, a magnified clarity plot, or recommendations for settings that will showcase this Montana cabochon to best effect, we are available to guide you through the selection and customization process.