Stones stones and more stones! But what kind??

I got a bunch of costume jewelry from a friend of mine that I kept just because they are different from the typical jewelry I see today and to me original and unique is the best!!! Anything different that the usual interests me...anyways maybe one can help me out with what kind of stones/gems these are??? If any at all??? And even some history about it would be great too...I’m pretty sure the only one that is some sort of antique is the silver heart with the yellow/orange stone in it marked “Sterling”...and I think the necklace is tigers eye and it’s is marked “Matisse” on the clasp.... and I’m
Assuming the rest are maybe 70s or 80s jewelry? I may be wrong tho.

 

Tiger eye,dyed agate,dyed druzy quartz,yellow one looks like agate.The heart is die stamped and may not be older than 20 years.

 

Oh I thought since it was stamped “sterling” it’s would Ben older than that...I’m very new at this game so I am learning the very basics basics. Hence the reason I post in this forum. To take in as much information as possible. Thanks

 

We were still using sterling stamp in 2000 at a well know designer jeweler.And I have purchased stamped pendants and other findings from Rio Grande with sterling stamp probably 10 years ago.

https://www.riogrande.com/product/sterling-marking-stamps-bent-shank/11212902gp