Ignoring a sluggish local luxury car market, Rolls-Royce is now taking orders for its $685,000 first-ever SUV, and expects it to be its best-selling model to date.

Named after the world's largest uncut diamond, the Cullinan is an all-terrain, all-wheel drive, high-bodied model with a 6.76-litre twin-turbocharged V12 engine.