0.56 Ct. Bluish Green Sapphire from Montana

This transparent 0.56 carat fancy shape bluish green sapphire measures 5.56 x 4.76 x 3.04 mm, and is presented with a mixed brilliant cut that maximizes scintillation and return of light. The stone displays intense color intensity and an excellent polish that enhances surface reflectivity, while clarity is graded slightly included at eye level, typical for many Montana sapphires and not detrimental to wear or overall visual appeal. This sapphire has been heat treated, a stable and widely accepted enhancement that improves color saturation without compromising structural integrity. Origin is Montana, and the combination of a distinctive teal to bluish green hue, transparent body, and precision cutting makes this piece a strong choice for buyers seeking a natural, characterful sapphire. The Natural Sapphire Company stands behind the description and provenance, and this gem is well suited to collectors and design projects that value provenance, stable treatment, and a balance of color and clarity.

When evaluated against other gemstones in its category, this Montana sapphire exhibits a lively, satiny brilliance characteristic of corundum, with a refractive index around 1.762 to 1.770. Compared to spinel, which has a refractive index near 1.712 to 1.736, this sapphire returns light with slightly greater intensity and fire, while tourmaline and aquamarine, with lower refractive indices, appear less brilliant under identical lighting. Diamond remains in a different class with a much higher refractive index and dispersion, producing more pronounced fire, but within the colored stone market, a well cut sapphire such as this offers a more velvety, deep flash of color and scintillation than many step cut or heavily included sapphires. Montana sapphires often show attractive pleochroism and subtle zonal color, and the mixed brilliant cut here is selected to balance those effects, revealing flashes of blue and green as the stone moves. For an educated buyer, this gem represents a combination of verified origin, stable enhancement, concise measurements, and a cut that amplifies optical performance, making it both a wearable and collectible example of American corundum from The Natural Sapphire Company.