Seam opal from Glengarry/Grawin. There is a fine red seam on the top. This stone has been priced on the visible coloured portion which is only on approximately a quarter of the top.
A small beginners deal.The colour is generally on dark grey potchthere is realy the one piece with color the top bitA great way to to start to cut black opal from Lightning Ridge
The colour bar on this pieces looks like it only goes in on the corner. (About 1 cm triangle )That is what the piece is priced on if its bigger then you have extra well.