8. Grace Kelly – $4.6 Million
Back in 1995, Prince Rainier III of Monaco proposed to Grace Kelley with a mahoosive 10.47 emerald-cut diamond ring, by Cartier.
The ring has received a lot of attention over the years, and rightly so, it’s an incredible piece of jewellery with a unique history.
If you’re in the market for an engagement ring and you have around $5 million to spend, then use this one as a reference point and you won’t go wrong!