Also the dispute this generates! You wouldn't believe how many friendships are torn apart over the question of whether it is "die Nutella" oder "das Nutella".
It is "die Nutella", just so we are clear!
FTFY
Two can play this game. There is no sane answer.
Except for rules of thumbs like "Romance-sounding word ending in -a is probably female".
On a semi-related note: in the Rhineland gendered articles are also used colloquially when talking about people: "Der Mark", "Die Steffi" and so on. I was born into this but I'm unsure how I feel about it after finding out it's actually non-standard in the rest of Germany.