0.42 Ct. Greenish Blue Sapphire from Montana

This listing describes a single transparent, radiant shape greenish blue sapphire, provided by The Natural Sapphire Company. The stone weighs 0.42 carat and measures 5.76 by 3.31 by 2.43 millimeters. It has been cut to a radiant profile, and displays an intense color saturation with a greenish blue hue. Clarity has been evaluated at eye level as very slightly included, and the surface finish is graded as excellent polish. The sapphire has been heat treated, a conventional and stable enhancement for color optimization, and its origin is Montana, a source noted for producing sapphires with distinctive cool tone ranges and good transparency.

The radiant cut of this sapphire is characterized by a carefully considered geometric faceting scheme that combines trimmed corners and a pavilion structure designed for light retention and dispersion. The faceting pattern employs a series of linear facets on the crown and pavilion that intersect at deliberate angles, producing multiple reflective planes. This geometry increases internal reflections and promotes lively scintillation under directional light, while maintaining a balanced face up appearance. The proportions of five point seven six millimeters by three point three one millimeters by two point four three millimeters yield a compact yet proportionate outline that optimizes the interplay of depth and table size. The very slightly included clarity grade indicates that inclusions are minimal and are not readily visible at normal viewing distances, allowing the geometric faceting to perform without significant obstruction from internal features.

Color and optical performance are central to the character of this sapphire. The stone presents an intense greenish blue color, a palette that benefits from the cool, slightly teal inflection common to Montana material. Because of its transparency and the radiant cut geometry, the stone exhibits both strong color saturation and apparent brightness, with areas of light dispersion visible as the piece is moved in different lighting conditions. The heat treatment applied to the stone is consistent with standard industry practice to refine and stabilize color, and does not detract from the natural origin or the gemological integrity of the crystal. With excellent polish, facet junctions are clean and reflective, contributing to crisp facet contrast and effective light return. The combination of intense color, well controlled clarity, and precision polish supports a presentation that reads as vivid and refined when examined from both face up and profile perspectives.

Practical considerations for setting and use are straightforward. At zero point four two carat and with the stated dimensions, this sapphire is well suited to accent roles in fine jewelry, including solitaire pendants, three stone rings, and detailed halo settings that take advantage of its compact rectangular profile. The radiant shape offers secure bezel or prong mounting options, and the measured depth of two point four three millimeters supports stable girdle engagement without excessive table size loss. As with all corundum, the sapphire benefits from a hardness near nine on the Mohs scale, providing durable wear characteristics suitable for daily use when set in appropriate mounting designs. The Natural Sapphire Company documents origin and treatment as part of its standard disclosure practice, and this piece is offered with those specifications to assist in evaluation and setting decisions.