AVHerald: A Jetstar Airbus A321-200, registration VH-VWZ performing flight JQ-413 from Coolangatta/Gold Coast,QL to Sydney,NS (Australia) with 190 people on board, was enroute at FL280 about 60nm northwest of Newcastle,NS (Australia) when the crew decided to divert to Newcastle's Williamstown Airport due to an unusual odour in the cabin.
Here is the audio I've clipped up: