0.73 Ct. Bluish Green Cabochon Sapphire from Montana

This listing describes one transparent 0.73 carat round shape bluish green sapphire from Montana, presented by The Natural Sapphire Company. The gem measures 4.93 by 5.02 by 3.04 millimeters, and it is fashioned as a cabochon cut, producing a smooth domed profile rather than faceted planes. Clarity is graded as included when evaluated at eye level, a common characteristic for material of this origin, and the overall color intensity is assessed as very light, offering a soft pastel bluish green appearance. The surface condition is excellent polish, indicating meticulous lapidary finishing that maximizes lustre on the dome. Enhancement is heat treated, a standard and stable treatment used to clarify tone and improve hue uniformity in sapphires, and the provenance from Montana points to the distinctive, subtle palette and crystal habits associated with that source.

From a cutting and optical perspective, the cabochon profile controls how light interacts with the stone, favoring broad internal glow and gentle reflection rather than discrete facet scints, which makes optical behavior more reliant on dome geometry and internal transparency. At a height of 3.04 millimeters on a roughly 5 millimeter span, the dome to diameter ratio yields a moderate crown that balances internal light return and wearability in practical settings. The stone exhibits transparent body color with included features visible to the unaided eye, which in cabochons typically present as feathering, crystal inclusions, or minute fluid cavities, each of which can add character and indicate natural origin. Sapphire hardness near nine on the Mohs scale assures excellent durability for daily wear, while refractive index values in the range expected for corundum contribute to the gem's refractive behavior, with minor birefringence creating subtle directional color effects, particularly when the piece is viewed from different orientations.

Color and clarity analysis for this bluish green Montana sapphire emphasizes its very light intensity and the nuanced tonality that collectors and designers prize. Montana deposits often yield delicate pastel blues, teals, and bluish greens that respond beautifully to careful cutting, and the present cabochon preserves that soft hue while offering a crystalline transparency that allows internal character to be appreciated. The included clarity grade signposts the presence of natural growth features, and under polarized or oblique lighting these inclusions can produce desirable internal texture without materially compromising structural integrity. Heat treatment, applied in a controlled manner, has been used to stabilize and refine color distribution, diminishing absorption features that could otherwise mute the stone's visual effect. For discerning buyers, the combination of provenance, treatment disclosure, and visible internal features supports an informed assessment of rarity and aesthetic fit for particular design applications.

In terms of setting and care recommendations, this 0.73 carat cabochon is well suited to bezel and low profile mountings that protect the dome edge while showcasing the gentle internal glow, and warm metals such as yellow or rose gold tend to accentuate the green component of the tone while cool metals like platinum or white gold emphasize the blue. Because cabochons do not rely on light entering and reflecting from facets, the design choice can influence perceived color intensity, with open back settings allowing more transmitted light and closed back mountings creating a slightly more muted presentation. Routine cleaning with warm soapy water and a soft brush is recommended, and avoid prolonged ultrasonic or steam treatment when obvious fissures are present, even though heat treated corundum is stable under normal wear. The Natural Sapphire Company is available to provide additional high resolution photographs, lighting view videos, certification options, and bespoke setting services to ensure the stone is matched to a design that highlights its Montana character and cabochon form.