You’ve got some great advice from crystal expert @Christina4, @NoName! I’d definitely take a peek at the resources she shared 
I know your struggles- we were trying to identify amber and it turned out to be much harder than we thought! It turns out that amber floats in saltwater and shines in UV light- I imagine every crystal has its own unique tricks to check if it’s real. Identifying crystals is kind of like identifying mushrooms in that regard 
You’ve got some really gorgeous pieces! Good luck with your identification 