What does having a diamond be labeled as "ideal cut" imply?

A diamond labeled as "ideal cut" signifies that it has been expertly shaped and proportioned to reflect light in the most optimal way. This classification is key to achieving maximum brilliance and fire, which are the visual characteristics that make a diamond particularly desirable. An "ideal cut" considers the interplay of several dimensions, including table size, crown angle, and pavilion depth, ensuring that light enters through the top of the stone and is reflected out through the table, enhancing its sparkle.

While factors such as carat weight, clarity, and presence of inclusions can greatly influence a diamond's overall quality and value, the term "ideal cut" specifically addresses the diamond's cutting quality and how well it interacts with light. Therefore, the focus is exclusively on the proportions and finish that create optical performance rather than on the size or clarity ratings of the gem.