see this pendant
Looks like stone or wood but its made of Scottish Heather !
On the programme they showed picking the heather, drying , soaking in dye , drying , then soaking in resin and then compressing - once dry they cut and get the most amazing designs.
Here is link to see how they do it
video of them making (not as long as the tv version but gives you an idea what is done )
Its got me thinking