John Krook

John would probably be one of the founding instigators of opal education and has been lecturing with me every time we have taught the Gemmological Association of Australia’s Advanced Opal course. 

John is a long time opal cutter and this is what his part of lecturing mostly involves. He learnt opal cutting on the fields of Lightning Ridge and in particular Glengarry where he lived on the fields for many years. What John does not know about cutting Lightning Ridge black opal does not need to be discussed.