1.62 Ct. Bluish Green Cabochon Sapphire from Montana

One beautiful translucent 1.62 carat round shape bluish green sapphire, dimensions 6.54 x 6.52 x 3.77 mm, cabochon cut, clarity grade slightly included evaluated at eye level, medium color intensity, excellent polish, enhancement heat treated, origin Montana, offered by The Natural Sapphire Company. The near perfect round outline and a dome height of 3.77 mm create a classical cabochon profile that preserves mass while optimizing optical return. The surface exhibits an excellent polish that minimizes microscale diffusion, so the surface specular highlight remains crisp while the stone retains a soft, internal glow. The slight inclusions present at eye level are stable and natural, contributing to a textured depth rather than detracting from the overall appearance.

Technically, the sapphire s internal structure and the cabochon execution combine to produce a form of sparkle that is distinct from faceted scintillation. Corundum s refractive index, approximately 1.76 to 1.77, favors strong internal reflection within the dome when light enters at oblique angles, and the cabochon curvature redirects that light back through the crown as broad flashes and concentrated areas of luminous contrast. The stone s translucency allows for subsurface scattering, which, combined with medium color saturation, yields layered tones that shift from bluish to greenish depending on viewing angle and light source. Slight inclusions act as micro reflectors and scattering centers, creating pinpoint flashes and localized brightness that punctuate the softer overall glow, a visual effect that many collectors find uniquely appealing. Heat treatment improves color distribution and reduces some of the finest silk, enhancing transparency while maintaining the natural character and origin markers typical of Montana sapphires.

From a craftsmanship perspective, the cutter balanced dome curvature, thickness and symmetry to maximize the interplay between surface luster and internal light return. The excellent polish preserves specular reflection and contrast, while the cabochon format preserves weight and emphasizes color dynamics and depth. For buyers who appreciate structural complexity and nuanced optical behavior rather than classic faceted fire, this Montana bluish green cabochon represents a technical and aesthetic specimen, and The Natural Sapphire Company is pleased to present it to connoisseurs seeking an inherently luminous and characterful sapphire.