0.91 Ct. Bluish Green Sapphire from Montana

This 0.91 carat, fancy shape bluish green sapphire measures 6.90 by 5.34 by 2.20 millimeters, and presents a meticulously executed step cut that accentuates the stone s internal geometry. Originating from Montana, this sapphire exhibits a light color intensity that leans toward a cool, complex bluish green, and it has been heat treated to stabilize and enhance that natural hue. Clarity is graded as very very slightly included when evaluated at eye level, which preserves near transparent visual purity while allowing the gem to retain character under magnification. The polish is excellent, producing crisp facet junctions and mirror like facet planes that are essential to the optical performance of a step cut in corundum. At The Natural Sapphire Company we highlight the combination of weight, dimensions, and proportion that make this gem ideal for a refined, low profile setting where the geometry and color can be seen uninterrupted.

The step cut chosen for this sapphire emphasizes planar facets and parallel lines rather than the multitude of small facets used to maximize dispersion. The cutting geometry here is organized into broad, concentric steps on the crown and pavilion, with a generous table that reveals the body color and internal features. A deliberate balance of crown and pavilion angles has been maintained to work with corundum s critical optical parameters. Corundum has a refractive index around one point seven six to one point seven seven, and a critical angle near thirty four point five degrees, so the pavilion facets are executed to promote efficient total internal reflection while avoiding excessive leakage, producing strong specular flashes. The depth of the stone at two point two millimeters gives an effective depth percentage of approximately thirty six percent when compared to the averaged face dimensions, a proportion that supports both clean face up color and lively light return for a step faceted profile. Precision cutting and the high hardness of sapphire yield razor sharp facet edges and symmetrical step tiers, attributes that are evident in the gem s faceted topology.

Optically, this Montana sapphire delivers a distinct type of brilliance that differs from brilliant cut stones, and it is this difference that creates an unmatched sparkle. The step cut generates focused, broad flash patterns as opposed to many small points of scintillation, and those flashes are amplified by the excellent polish which minimizes surface scattering. Corundum s modest dispersion means fire is subtle, but its birefringence, though low, can introduce a faint doubling of facet edges that adds depth and a layered shimmer when the gem is rotated under light. Pleochroic tendencies in sapphires are managed through careful orientation of the cut, and in this example the cutter oriented the symmetry to present the most desirable mix of bluish and green tones across the table. Heat treatment has reduced microscopic silk inclusions that would otherwise diffuse light, improving internal transparency and therefore increasing the contrast between dark and light facet areas. The result is a distinctive, architectural sparkle characterized by broad, mirror like flashes, clear color windows, and a subtle internal glow that reads as a cool, watery luminosity unique to well cut blue green Montana sapphires.

For designers and connoisseurs seeking a gem with technical refinement and provenance, this sapphire from The Natural Sapphire Company is an excellent choice. Its combination of near one carat weight, precise step cut, and exceptional polish makes it suitable for settings that showcase geometry, such as hexagonal bezels or low profile prong mounts that allow unobstructed table view. The stone s hardness and stability, combined with the permanence of heat enhancement, ensure long term durability and color retention. From a craftsmanship perspective, the cutter s attention to facet alignment, pavilion depth, and table size has been optimized to exploit corundum s refractive behavior, producing a sparkle that is architectural rather than scattered, and that presents as a coherent play of light and color. For clients who value the interplay of cutting science and natural beauty, this Montana bluish green sapphire represents a technically sophisticated choice that reads as both understated and luminous.