A word to the wise on the black honduran opal-
The stuff I have seen is precious opal in a basalt matrix, and it’s
beautiful when it’s wet-- black, with all sorts of pretty sparkly.
Once it’s cabbed and polished, it tends to be more of an unaesthetic,
dirty grey, due to the porosity of the basalt. It would probably
improve greatly with an opticon treatment, or possibly with the kind
of sugar treating normally done to Andamooka matrix.
I’m not saying that you shouldn’t buy this stuff, but I would
recommend that you buy a small amount, cut it, and see how you like
the finished result before making a large purchase.