Clarity

The clarity or a diamond refers to its internal features (inclusions) or
surface characteristics (blemishes) within, or on a diamond. It is
determined by the degree to which it is free from inclusions (naturally
occurring flaw). A minute trace of non-crystallised carbon or small
non-diamond crystals, inside or on the surface of a diamond, often called
nature’s fingerprints. The number, type, size and position of these
inclusions can and will affect the clarity, and ultimately the value of
the stone. Many are invisible to the naked eye and require a standard 10x
magnification loupe to be detected. The fewer inclusions the rarer the
stone. Upon reaching I1 the stone is no longer considered to be eye clean.
Inclusions are now visible to the naked eye.