How many facets does a standard round brilliant-cut diamond typically have?

A standard round brilliant-cut diamond typically has 57 facets, which include 33 crown facets (the upper part of the diamond) and 24 pavilion facets (the lower part). Additionally, the diamond contains one table facet on the top surface. This total of 57 facets is regarded as the ideal structure that maximizes the diamond's brilliance, fire, and scintillation.

Some variations in facet counts exist; for instance, a diamond may also have a culet facet, bringing the total facet count to 58 in certain designs. However, the most widely accepted and referenced count for a round brilliant-cut diamond is 57 facets. This configuration allows for optimal light performance and is the standard against which many diamond cuts are compared.

Understanding the standard facet count is crucial for those in the diamond industry as it helps in assessing return on light and overall visual appeal, which are key elements in determining a diamond's quality.