Black Inclusion (Natts)

Black Inclusion (Natts) in diamonds are graded on the following basis:

Black Inclusions or Natts in general, are the inclusions that are found in the diamonds.

SGS Black Inclusion Description
B0 No Black Inclusion
B-1 Minor Black Inclusion
B-2 Medium Black Inclusion
B-3 Major Black Inclusion

We generally specify two parts of the black inclusions:

  • Table black inclusions
  • Side black inclusions