0.90 Ct. Green Sapphire from Montana

One transparent 0.90 carat cushion shape green sapphire from Montana is presented by The Natural Sapphire Company, with dimensions 5.16 x 5.14 x 3.64 mm and a mixed brilliant cut. The gem exhibits a balanced cushion silhouette with softened corners and gently curved pavilion lines that complement the mixed facet architecture. The term mixed brilliant describes the combination of a brilliant facet configuration on the crown with a modified pavilion design, which in this example has been executed to preserve weight while optimizing light return. The cutter has maintained a careful table proportion and symmetry that allow the crown facets to act as primary light collectors, while the pavilion facets direct light back through the crown in multiple reflective steps. The stone is transparent with an excellent polish, and the clarity grade is very slightly included when evaluated at eye level. Enhancement is heat treated, a stable and traditional process for corundum that refines and stabilizes color without affecting structural integrity.

Color is a principal attribute of this Montana green sapphire, and it displays intense color intensity with a rich, saturated face up appearance. The hue is a complex green that leans toward bluish green in certain lights and toward deeper forest green in others, which is typical of Montana material where iron related chromophores dominate. The faceting and the relatively deep pavilion, with a depth of approximately 71 percent of the average diameter, intentionally concentrate color, producing a vivid, saturated tone without appearing muddy. Because the rough was judiciously oriented prior to cutting, the gem exhibits even color distribution with limited zoning and with pleochroic behavior that gives subtle shifts in hue when the stone is rotated. The very slightly included clarity grade indicates the presence of minor internal features, such as pinpoint crystals or fine silk, that do not detract from the gem when worn, and that in some lighting contribute to a desirable internal texture and light diffusion.

The precision of the cutting and finishing is evident in the facet junctions and the overall optical performance. The refractive index of natural corundum, approximately 1.76 to 1.77, paired with low birefringence, allows the carefully executed brilliant facets to produce crisp reflections and lively scintillation. The mixed brilliant approach was selected to reconcile color saturation and brilliance, and the cutter achieved symmetry that minimizes windowing while maximizing return of light to the observer. The excellent polish enhances facet contrast and ensures clean, mirror like reflections across the crown. The result is a face up presentation that balances depth and brilliance, so that the sapphire reads as intensely colored and lively in motion. The heat treated enhancement has been applied in a controlled manner to improve hue uniformity and clarity, and because the treatment alters lattice impurities in a stable fashion, the optical improvements are permanent under normal use conditions.

Over the years this Montana green sapphire will continue to captivate, both because of inherent material properties and because of the quality of cutting and finishing provided by The Natural Sapphire Company. Corundum rates nine on the Mohs hardness scale, which confers outstanding resistance to abrasion and ensures that surfaces retain luster through routine wear. The excellent polish combined with solid facet junctions means that the gem will maintain strong light performance, and the heat treated color enhancement is stable when the stone is cared for properly. Routine maintenance for long term beauty is straightforward, involving warm soapy water and a soft brush when needed, with periodic professional inspection recommended to ensure secure settings and to address any accumulation of oils or debris. Properly set and maintained, this cushion shape green sapphire will remain a compelling visual centerpiece for many years, offering consistent color saturation, lively brilliance, and the provenance of Montana origin as part of its enduring appeal.