ok, you have the color grade(D,E,F,G,H,I,J...), but clarity goes like this:
VVS, VS, SI SI1 SI2, SI3 etc..
(very very slight, very slight, slightly imperfect etc)
The cut is the shape of the diamond i.e round, princess, marquis, heart etc.
The GIA certification is the papers it should have come with, generally this certifies the diamond to be of the color, clarity, and cut specified. If it doesn't have this, then the store can call it whatever they want, and for that matter it could be a piece of rock candy cut into a diamond shape.
the clarity is s1 the cut is round but no man the diamond is for real i had it checked by freedmans diamond specialist they said that it was worth 1300 to 1400 ?? the woman i talked to said the rock was really nice