I really don't mean to rain on your parade as I love Harry Potter as well but I believe the reference to be directed at the philosophers stone used in Alchemy.
https://en.m.wikipedia.org/wiki/Philosopher%27s_stone
Also Nicolas Flamel was a real French writer who supposedly created a real Stone.
https://en.m.wikipedia.org/wiki/Nicolas_Flamel
Again I love Harry Potter but I also find this stuff fascinating.
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Thanks for the info tho. That's even more interesting. Time to dive down the Wikipedia hole!
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Yea some of that stuff is amazing. If this stuff interests you I highly suggest reading the alchemist by Paulo Coelho. Amazing book.
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Oh...well... Now I'm sad.