Diamonds are for never

Following my registration on a boaty site for crewing, I was contacted by a foreign sounding/slight Aussie twang overlay gentleman, offering me the chance to sail up the Barrier Reef and out towards Samoa, where, he said, diamonds have been discovered. He said he'd been given a handful (or maybe even more) of these diamonds - what an incredible getrichquick opportunity, no? The smell of rats wafted along the phone lines. Wishing to save his phone bill, among other reasons, I declined his kind offer to enrich me.

Anyone else come across this amazing chance for once in a lifetime untold wealth?