Prepare to be seriously jealous
Being queen of all things extra, we weren't exactly surprised to find out Mariah Carey takes the cake for the most expensive rock. James Packer popped the question in 2016 with a 35-carat diamond and platinum ring crafted by jewellery designer Wilfredo Rosado. The grand total? A whopping $10 million (£7.7 million). Unfortunately, the couple never made it down the aisle-but it's rumoured that Carey held on to the ring.