Gday Gemo I am a full time miner and its a tough game sometimes you do very well other times I have to go roos Shootin Ill get a job working for a cocky so you can afford to buy some diesel to go back underground Opal price has come back up a bit and black is always easy to sell usually we sell to buyers they stay in motels in town and put a sign out the front to tell us which room they are in and you just go and knock on the door and yes you can sell on eBay or we have buyers that we just sell to all the time buyers are always a bit dodgy last year I sold two stones one for $2000 one for $3000 I had cut both of them so they were finished stones. The next day he had them on his site for 12,000 and 15,000 which is pretty typical. No two opals are the same you cant work out a Standard per carat price lots of blokes come to make there fortune Opal mining not many of them last it is like a sickness you will sell everything and do anything just to get back under ground to try and find a better opal than you found before. You have to have a real love for Opal and the lifestyle one of the few places left you can still have some freedoms to do what you want.