Hue in Sapphires

Hue refers to the dominant color of a sapphire and is one of the key elements used to evaluate its overall quality. For blue sapphires—the most classic and widely recognized variety—the ideal hue is a pure, vibrant blue with no modifying undertones. However, many natural sapphires display secondary hues, which can subtly alter the appearance of the stone. Common secondary hues in blue sapphires include violet, purple, or green.

A slight violet or purplish tint is generally considered acceptable and may even enhance the sapphire’s appeal by lending it a richer or more velvety tone. These stones are often described as “violetish blue” and are still highly valued, especially if the saturation and tone are strong. In contrast, sapphires with noticeable greenish-blue or grayish-blue hues are typically considered less desirable. A green modifier can give the stone a teal or muddy appearance, while a gray modifier tends to dull the overall color, making the sapphire appear less vivid and lively.

Gemologists often describe hue by listing the modifier first and the dominant color second—for example, a sapphire with a slight violet secondary hue would be labeled “violetish blue.” The dominance, strength, and balance of these hues greatly affect both the visual beauty and market value of the gemstone. A well-balanced sapphire with minimal color zoning and a strong, pure hue—especially one leaning toward royal or cornflower blue—is considered the standard of excellence in blue sapphire quality.

• Pure Blue (ideal sapphire hue)

• Violetish Blue (acceptable secondary hue)

• Greenish Blue (less desirable)

• Grayish Blue (least desirable)