how can i see what "grade" weaps and armor are?

is that that color in wich their pricing is done? the blue, purple etc?

On the right of the name on weapon theres a SQUARE with a letter insida, D,C,B,A,S for example .............

aah thanks :) ill go shopping and see if i can find it.

Also you can go here (http://www.lineage2.com/Knowledge/item.html) and look at everything without running around everywhere. :)

Those colours indicate price ranges - they're a way to warn a player from buying something that's got the quantity and price of the item switched around (for example 64 SSB for 500k each :p ) or a zero or two added. :) I don't know what colour corresponds to how many digits, but you can easily check that by setting up your own sellstore.

You should know all grades of all weapons, including most important SA's they can have.. no need to check some library! :)