This little triangle of opaque petrified (turned to stone) Lune River (Southern Tasmania) fern dates back 50 million years to Gondwanan times! That's REALLY old! - like when Australia was still connected to Asia, Antarctica, New Zealand .... Anyway, here it is as a little triangular slice from that era, showing excellent detail of the fern structure and set in recycled sterling silver on a 50cm silver snake chain. 

Tasmanian Petrified Fern