Upvote:3
While there was an idealzed physical appearance of the "master race" (blonde hair, blue eyes, ect.), it was not practical to use that as a basis for discrimination because too few people would have passed - most importantly not Hitler himself!
Instead, the Aryan certificate required to keep full citizen's rights was based entirely on ancestry: if your parents and grandparents were non-Jewish Germans (or at least non-eastern europeans), then you were considered "Aryan". There was a more strict certificate required for SS and NSDAP membership.
So as long as you had your certificate, you didn't suffer any official discrimination, though there probably was the kind of unofficial discrimination that you still see today as racial discrimination, towards people whose looks fell too far away from the ideal.
Upvote:3
To qualify as “Aryan” you had to prove that none of your four grandparents was Jewish. In practice, this meant that you had to prove that they were baptised Christians. If you had a Jewish great-grandparent you would still qualify as “Aryan” if that great-grandparent had converted to Christianity and had his or her children baptised. So the Nazi “race” policy actually boils down to a question of religion. But that is because race is an essentially fictitious concept.
There is a fairly detailed discussion here: https://de.wikipedia.org/wiki/Ariernachweis