What characterizes a "salt and pepper diamond"?

A "salt and pepper diamond" is characterized by its distinctive appearance that includes visible dark inclusions, which create a speckled or mottled effect. The term "salt and pepper" describes the contrast between the light (like salt) and the dark inclusions (like pepper) found within the diamond. These inclusions can be in the form of carbon spots or other minerals, and they contribute to the diamond's unique aesthetic, often appealing to those who appreciate a more organic and less traditional look compared to clear diamonds. This characteristic makes each salt and pepper diamond unique, showcasing a blend of beauty and individuality.

The other options do not accurately describe this type of diamond. For instance, a diamond that is completely clear would have no inclusions at all, and a diamond that is entirely white would lack the distinct mixed tonality that characterizes a salt and pepper diamond. The notion of irregular shapes could refer to other types of diamonds but is not a defining characteristic of salt and pepper diamonds.