I love that even after millennia of human society and culture, I still regularly run into comments that make me think, "Yeah, that's the first time anyone has ever said that."
If the universe is truly infinite and as homogeneous as it appears to be, then an infinite amount of people had already said that, will say that and are saying it right now.
Infinite possibilities does not mean all possibilities. It is possible - even probable, in most cases - to have an infinite set which does not contain all possible members.
As an example, the set of all even numbers and the set of all whole numbers are both infinite sets with completely different contents. Even accounting for the fact that the set of all whole numbers contains the entire set of all even numbers, the two will still differ by a factor of 50%.
Gold and silver are safe. Lead is dangerous for completely unrelated reasons. Cupric alloys are probably safe assuming you aren’t allergic. Speaking of allergic you can definitely do nickel if you’re completely not allergic to it. Aluminum should be safe.
Not metallic and not sure about ‘alternative uses' but ceramic is good for finger rings at least. It's non-conductive, you can use a pliers or tap it hard with a hammer to shatter it if needed, and if it snags on something in a horrific accident scenario it'll usually shatter before degloving or severing a finget