What does the term "feather" refer to in the context of diamonds?

In the context of diamonds, the term "feather" refers specifically to an inclusion within the diamond. Inclusions are internal flaws or imperfections that can occur during the diamond's formation, and they can affect its overall clarity and value. A feather inclusion appears as a thin, elongated fissure or crack resembling a feather, typically formed due to the internal stresses experienced by the diamond.

Understanding feather inclusions is essential for assessing a diamond's clarity grade, which is a key factor when evaluating gemstones. Compared to other types of inclusions, feathers can sometimes be less impactful on a diamond's appearance, especially if they are located in less visible areas or are not prominent. Clarity grading in diamonds considers feathers along with various other characteristics, highlighting their importance in determining gem quality.