Off the FJ Website - it appears to be the QF lounge
You have the use of our Tabua Lounge at Nadi International Airport and selected affiliated lounges overseas whenever you are departing on an FJ designated international flight (flight numbers starting with "FJ"), subject to space availability and lounge operating hours. Affiliated lounges currently include the Qantas Lounge in Sydney, Brisbane, Melbourne, Auckland and Wellington, Air New Zealand Lounge in Christchurch, Premium Plaza/Travellers Lounge in Hong Kong and International Lounge in Los Angeles.