Hi , google " diamond vision not road legal"
It suggests they are not road legal in EU due to not having the required E mark.
Having seen pictures online of the 4300k Crystal visions Vs 5000k Diamond Visions there is not a lot in it and not worth the risk.
4300k is more of less Oem xenon colour temp
Its unlikely they would get checked or pulled, but I would prefer to stay legal and not draw unwanted attention.