What color hair is this should i do it?

Im not really for sure what that color is but it is beautiful... Yes I think that would look very nice~~ You should definitely go for it!!!!! It really looks like a chestnut brown to me, I am pretty sure it even says it in the link you pasted up there^^^ If you had dark hair naturally I wouldn't suggest this color, but I am thinking going from blonde to chestnut brown would look very nice:)