5.91 Ct. Green Sapphire from Montana

This is a beautiful, transparent green sapphire from Montana, presented by The Natural Sapphire Company, weighing 5.91 carats, cut in a classic cushion shape, with exact dimensions of 11.47 x 8.54 x 6.42 mm. The pavilion and crown have been skillfully faceted in a mixed brilliant cut, combining the scintillation of brilliant style facets with the softer, broad planes typical of a cushion cut. The stone exhibits intense color intensity and an excellent polish, giving strong brilliance and a lively surface appearance. Clarity has been graded as eye clean when evaluated at eye level, which means that under normal viewing there are no visible inclusions to interfere with light performance or the gem aesthetic. Importantly, this sapphire is natural and untreated, with no enhancement, offering collectors and custom jewelry designers an authentic and stable material to work with.

To a gemologist and an informed buyer, several technical aspects underline the value of this sapphire. The intense green hue is consistent with Montana sapphires that derive their color from natural iron content, and the saturation and tone are well balanced, providing depth without appearing overly dark in standard lighting. The mixed brilliant cut is chosen to maximize return of light while preserving weight, which is especially desirable in larger stones like this one, because it enhances both face up brightness and internal sparkle. The excellent polish indicates meticulous lapidary work, reducing surface scattering and improving facet contrast. With a Mohs hardness of nine, sapphire ranks among the hardest gem materials after diamond, which makes it suitable for daily wear in rings and other jewelry, while maintaining resistance to abrasion and preserving facet crispness over time.

This sapphire is particularly ideal for custom jewelry because of its generous dimensions and versatile cushion outline. At 11.47 x 8.54 mm and nearly six carats, it commands presence as a single center stone in an engagement ring, a statement cocktail ring, or a pendant that sits prominently on the neckline. The cushion shape offers soft rounded corners that lend a timeless and elegant profile, while the mixed brilliant faceting creates attractive light play that adapts well to both open prong settings and more protective bezel styles. For bespoke settings, designers may choose a four or six prong cathedral mount to elevate the gem and allow light to enter the pavilion, or a custom semi bezel to protect the girdle while maintaining face up visibility. The stone size also allows for creative side stone configurations, such as tapered baguettes to emphasize length, round brilliant melee for a halo effect, or a trio layout for a modern three stone design, each approach altering perceived scale and enhancing color contrast.

When commissioning a custom piece through The Natural Sapphire Company, this Montana green sapphire is an exceptional option for clients seeking a natural, unenhanced center stone with strong visual impact and long term durability. Our in house design team can advise on metal choice to complement the green hue, with warm metals such as yellow gold enriching the tone, and white metals like platinum and white gold offering contemporary contrast and accentuating brilliance. Care recommendations are straightforward, use mild soap and water for routine cleaning, avoid harsh chemicals, and have prongs and settings checked periodically by a professional jeweler to ensure continued security. Because the gem is untreated, documentation of origin and treatment status can be provided to support provenance and value. For bespoke commissions, we provide detailed advice on proportions, setting style, and side stone pairing to achieve balanced aesthetics and optimal light performance, ensuring that this fine Montana cushion sapphire becomes the focal point of a distinctive, heirloom quality piece.