0.67 Ct. Bluish Green Sapphire from Montana

This 0.67 carat transparent bluish green sapphire presents a compact yet commanding presence, with dimensions of 7.29 x 6.22 x 2.02 mm, and a fancy shape that departs from classical rounds and ovals. Color is an intense bluish green, distributed evenly through the stone with a depth that yields strong saturation when viewed face up. Clarity is graded very slightly included, evaluated at eye level, and the stone remains clean to immediate inspection with only minor inclusions that do not disrupt the gemological integrity. The cut is a refined fancy cut, executed to balance table size and pavilion depth for optimal light return given the shallow profile, and the polish has been finished to an excellent standard, producing crisp facet junctions and lively surface reflection. Enhancement by controlled heat treatment has been applied to stabilize and intensify the color, a widely accepted practice in the trade, and the documented origin is Montana, a source known for producing sapphires with distinctive cool green blue tones and robust crystalline character.

The cutting and finishing process for this fancy shaped sapphire reflects deliberate technical choices made to maximize optical performance from the rough material. The cutter left a moderately sized table to preserve face up color, while shaping the crown facets to a geometry that favors dispersion without sacrificing the deep saturated tones native to Montana material. The pavilion was tuned with slightly elongated facets to direct light back through the table, reducing windowing and preserving apparent weight. Faceting geometry was planned to accommodate the stone thickness of 2.02 mm, and to mitigate the visibility of very slight inclusions by positioning facets and facet angles to either refract or mask those internal features. Preforming and bruting were followed by successive laps with finer abrasives, and the final polish was executed on diamond laps to achieve the excellent polish noted in the assessment. Throughout the process, the cutter monitored pleochroic behavior to set orientation, ensuring the stone displays its most desirable bluish green hue when set. The heat treatment was applied under controlled conditions to reduce silk and enhance color saturation, without introducing secondary diffusion or surface residues, resulting in a stable, enduring color enhancement that is fully disclosed.

The journey of this Montana sapphire from mine to market embodies careful gemological stewardship by The Natural Sapphire Company, beginning with selective sourcing in Montana alluvial and primary deposits where the rough displayed promising color and clarity. The rough was documented and assayed on site, then transported to experienced cutters and gemological labs for mapping and planning. A cutting plan was developed to preserve weight while extracting the most attractive color plane, and the stone underwent precision cutting and polishing under strict quality control. After treatment, the sapphire was evaluated and graded for clarity, color intensity, dimensions, and polish, and it was photographed and cataloged for presentation. For setters and designers, the shallow 2.02 mm depth and fancy outline recommend certain mounting choices to protect the gem and showcase its color. A low bezel, fine prong setting that supports the girdle, or a custom gallery that allows light from the pavilion to enhance saturation, are preferred. Metal choices such as platinum or 18 karat yellow or rose gold will influence perceived warmth and contrast, with platinum offering a cooler frame that emphasizes the bluish aspect, and warmer gold alloys providing contrast that may enrich the green component. Routine care is straightforward, using mild soapy water and a soft brush, avoiding ultrasonic cleaners if the setting is untested, and avoiding rapid temperature change given the prior heat treatment. The Natural Sapphire Company stands behind the documented origin and treatment disclosure of this gem, and offers further technical details, mounting recommendations, and certification upon request, for buyers who value precision in provenance, cutting technique, and gemological quality.