Being a sedimentary opal, it is the most stable of all opals.
It will stand difference in ambiant temperature without being affected.( unlike some other opals who need to be kept in a humid environment, or even in water, to stop them from cracking or crazing).
It is also the hardest of all opals and does not crack under normal circumstances.
There is no need to keep it in water or keep it moist like most volcanic opals.
Boulder opal is a rare precious opal found exclusively in Queensland, Australia.
Despite claims made by some opal merchants, any so-called boulder opal found in any other country than Australia, is not a true boulder opal.
Australian boulder opal is found in cracks or cavities of various thickness, in a ferruginous (containing iron) rock, called ironstone.
Australian boulder opal is cut with leaving a thin layer of the mother rock on the back of the opal seam.
It is a very versatile opal as large boulder opals with little opal in it, are carved into very artistic pieces.
When cut and polished, by world standards, it is a "Natural opal,Type 2".
Cut and polished boulder opals (loose opals) ready to set are for sale on this page (4 pages).
Rough boulder opals for cutting are for sale on this page.
Rough boulder opal specimens are for sale on this page.
Polished boulder opals specimens are for sale on this page.
Boulder opal rings in solid sterling silver are for sale page.
Solid sterling silver boulder opal bracelets are for sale page.
Solid sterling silver boulder opal pendants are for sale page (2 pages).
Solid gold boulder opal pendants are for sale page.
( watch our videos showing how we used to mine our Australian boulder opal ).