Fair trade / ethically sourced / eco-friendly semi-precious stones?

I'd like to buy semi-precious stones for some work - wholesale - but have no resources as to where to buy fair trade stones.

I see some info on beads, but not a lot on stones, semi precious or precious.

Also interested in sourcing recycled gold and silver for jewelry findings....

I just attended a gem show - some beautiful items, but very few booth operators had a clue about where / how their materials were sourced. Sigh.

Meant to add, thanks for any input and suggestions. Going to cross post this in the Lounge.