Are Opals used as contraband?
Australia is incredibly fortunate in that it has escaped the rule of dictatorships and unscrupulous rogues who plunder and murder their own populations. Gems mined in Australia are sourced in 'leases' where the local Aboriginal tribes have given permission through their Land Rights authority and the miners have paid fees to be allowed to mine.
This means that (unlike Diamond) there is no "blood" on any Australian Opal!
Pliny the elder spoke about the value of Opals in eons past. Marc Antony wanted the Opal but Nonius would not give it up and fled Rome to keep his Opal and left his property, wife and family behind. This was Hungarian Opal which is far inferior to the Australian Black Opal...so even history mentions the only 'smuggling' of Opals was to avoid selling them!!!