Knot on VS2 Diamond, should I Buy? Please HELP

[rbottger]

Hello,

I have chosen a Diamond with this characteristics:

Shape: Round
Carat: 0.9
Color: F
Clarity: VS2
Cut Grade: Excellent
Polish: Excellent
Symmetry: Very Good
Fluorescence: None

Its Certificate by GIA. I think it´s a very good diamond but I am worried because the GIA certificate shows:

Clarity Characteristics: Feather, Knot , Crystal

I dont know how the Knot inclusion is going to affect the quality of the diamond. If the diamond has a clarity of VS2 that means that the Knot inclusion will not be seen with the naked eye by a person?

Thank you very much!

Richard