Sellers take picture of the rough dipped in water so the image will expose the colours of the stone as if it was polished. Buyer will recieve the opal rough in a dry condition.
This rough normally has good pattern which it is famous for.
Koroit rough is mainly deep strong ironstone with magic patterns and inclusions of colour. The rough is messy to cut but gets good high polish.
Koriot is only small opal field and lot small miner operators so not much quantity of rough available Koroit opal is home of Koroit Boulder and Matrix opal,close by are the opal mining fields of Jundah and Opalton that also produces matrix opal,some of these thin colour bars can produce beautiful patterns.blackgate opal field has produced some dark stunning matrix opal,also named as aboriginal art opal.
Conglomerate opal slabs from Koroit make top displays as natural patterns and kernels or koroit opal nuts look interesting.
