Like starlight in stone.... Opals.
and a big rock of Opal to carve also would be awesome. Freeform carved Queensland boulder opal
An amazing little selection of opals from around the world. DerHammerStein Auction
Australian Opal Rock, Beautiful!!!!!
Hey, I found this really awesome Etsy listing at https://www.etsy.com/listing/228724272/raw-opal-ring-australian-opal-ring-rough
This is soap...called Soaprock. This particular variety is called "banded opal" -- not to be confused for opal the stone. Follow the link for more info.
Raw opal ring Australian opal ring Rough opal ring by HAWKHOUSE
pinterest: Annie L Hayes
Stone Pendant, Robyn Cornelius, Little Rock Jewellery Studio, Sterling Silver, Peruvian Opal
Queensland boulder opal, 43 x 26 x 8mm, 73 carats