Royal family members Princess Diana and Meghan Markle often ... famous royal jewels in elegance and cost. The most expensive royal engagement ring belongs to Grace Kelly The most expensive royal ...

This $500,000 heirloom might not be the most expensive ring on the list, but it's sentimental value is worth so much more. Princess Diana also wore this ring while she was engaged to Prince Charles.

The identity of the buyer is unknown. The sale shatters the previous world record for the most expensive dress worn by Princess Diana to be auctioned. The previous record was set earlier this year ...