User blog comment:Dubbos/Tips for the Aurora/@comment-64.237.227.216-20170322190732

Actually you can fin diamonds in the grand reef, its pretty easy to get actually. if you have a seamoth already, dive 298 meters at the back of the aurora, there is a wreck and lots of outcrops. A few of them are basalt outcrops, which there is a chance it is diamond. Also as a bonus, you find lots of hard to find fragments there