Mariah Carey Shows Off Diamond Necklace Worth $500,000 From Billionaire Boyfriend

It's hard to impress your lady when she is pretty well off herself.

But James Packer managed to do just that when he dropped $500,000 on a yellow heart shaped diamond necklace for Mariah Carey.

The singer showed off her stunning new accessory on Instagram on Thursday, and not surprisingly was grinning from ear to ear.