0.67 Ct. Greenish Blue Sapphire from Montana

This is a transparent 0.67 carat cushion shape greenish blue sapphire, measuring 5.63 by 4.72 by 3.27 millimeters, with a depth of approximately 63.2 percent. The gem has been fashioned in a mixed brilliant cut, combining a brilliant style crown with a pavilion arrangement optimized for light return, which produces lively scintillation and a balanced face up brightness for its weight and dimensions. The pavilion and crown facets have been cut and aligned to control light leakage and maximize the apparent color saturation, and the overall finish is described as excellent polish, indicating well executed facet junctions and smooth facet planes that contribute to crisp facet reflections. The cushion outline and medium depth make this stone well suited for a variety of mounting styles, while the mixed brilliant architecture maintains strong scintillation across the table and crown facets.

Color and clarity have been assessed with technical precision, the stone displaying intense color intensity in a greenish blue hue that is characteristic of select Montana sapphires. The color is distributed evenly when observed face up, with the green and blue components combining to produce a vivid teal range that will respond to different lighting environments by showing subtle shifts in tone. Clarity is graded as very slightly included at eye level, which indicates minor internal features that do not materially impair transparency or brilliance. These inclusions are small relative to the viewing plane, permitting excellent light transmission and strong return, and they serve as natural fingerprints that trace origin and formation without compromising visual performance. The gem is transparent, and its combination of intense color, clean appearance, and precise cutting results in a gem that reads slightly darker face up than some lighter examples, which is typical for stones with concentrated saturation.

From a durability standpoint, this sapphire is corundum, which has a Mohs hardness of 9, making it one of the hardest natural gem materials available, second only to diamond on the Mohs scale. By comparison, quartz is hardness 7 and topaz is hardness 8, which illustrates how much more resistant corundum is to everyday abrasion. In addition to hardness, corundum exhibits excellent structural toughness and lacks prominent cleavage, characteristics that reduce the risk of splitting under normal wear conditions. These mechanical properties, combined with the stone being heat treated in a standard and stable manner to enhance color, mean the gem is well suited for daily wear in rings, pendants, and bracelets, provided conventional protective settings and good jewelry practices are followed. Heat treatment applied to this sapphire is durable and stable, and will not affect the Mohs based wear resistance, although appropriate setting choices and occasional professional inspection are recommended for long term preservation.

This Montana origin sapphire offered by The Natural Sapphire Company represents a technically refined specimen for connoisseurs seeking a compact, intense greenish blue cushion with professional cutting and finish. The mixed brilliant cut and the excellent polish produce a balanced interplay of brilliance and color, the clarity grading confirms strong face up transparency, and the Mohs hardness of 9 ensures exceptional resistance to scratching in everyday use. For mounting considerations, the medium depth and cushion outline are compatible with low profile collet settings or more protective bezel and prong combinations, and metal selection will influence perceived color temperature, with white metals emphasizing the blue component and warmer gold tones accentuating the green character. The Natural Sapphire Company can provide detailed measurements, imaging, and further technical documentation upon request to support custom design and setting decisions.