We grade Black Inclusion as follows.
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NT 0 indicates No Black Inclusions are present in the stone. It's a No Black Stone.
NT 1 indicates Minor Inclusion (0 to 10% of the total) is Black in the Stone.
NT 2 indicates Medium Inclusion (10 to 35% of the total) is Black in the Stone.
NT 3 indicated Major Inclusion (35 to 80% of the total) is Black in the Stone.
NT 4 indicates Most Inclusion (80 % & above of the total) is Black in the Stone.
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