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Download 24.77 MB While opals can be found in many countries, did you know that Australia produces about 95 per cent of them, including the incredibly famous and incredibly valuable black opal? So where do you find opals these days, what are they worth and just how do they get those amazing colours? Take a journey through the world of opals with Nick Trioisi, general manager of the Umoona Opal Mine & Museum at Coober Pedy and Tony Smallwood, a scientist, gemmologist and founder of the Opal Academy. Duration: 54min 6sec ....