4. Kim Kardashian – $8 Million
As always, only the best will do for Kim Kardashian.
Kanye proposed to Kim with a beautiful 15 carat D colour, flawless cushion cut diamond, made by Lorraine Schwartz.
The diamond itself is set as a solitaire on a thin platinum band with micro-pavé diamonds.
It really is a stunning example of bespoke jewellery and well worth its place amongst the most expensive engagement rings in the world.