In pearl grading, what signifies a 'poor' rating?

A 'poor' rating in pearl grading is indicated by significant flaws. This classification is based on the visibility and severity of imperfections on the surface of the pearl. Pearls with significant flaws may have noticeable blemishes, scratches, or spots that detract from their overall appearance and luster. Such imperfections can impact the value of the pearl, making it less desirable to buyers, as pearls are prized for their smoothness and overall quality.

Understanding the nuances of pearl grading is essential, as it helps buyers and sellers assess the quality and value of pearls accurately. Minor blemishes, those that may be light or less noticeable, do not greatly affect the pearl’s overall quality and therefore would not warrant a 'poor' rating. Blemishes that are not visible would typically indicate a higher quality pearl, and uniform color is a desirable attribute in pearl grading, suggesting consistency and aesthetic appeal.