Not as famous as Lightning Ridge, but a big percentage of  so called Lightning Ridge Black Opals actually come from Grawin ! It is argued that Grawin Opals are not as stable as Lightning Ridge Opal, but many others say that they are exactly the same.The close proximity would suggest that there is no difference apart from the name. 

If your looking for bargain Opals, and up for a bit of an adventure, I recommend you visit one of the mining pubs around the mining fields ! but don't get lost and watch out for the big red kangaroos.