From sparkling multi-million-dollar diamonds to custom designs, here are the most expensive diamond rings in the world that redefines luxury.

Royal family members Princess Diana and Meghan Markle often take the spotlight when it comes to royal engagement rings.

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.

Size isn’t everything—but the most expensive celebrity engagement rings of all time go down in history due to more than just their price tag. Many of these gobstopper-size sparklers worn by the ...

But aside from classic diamond engagement and wedding rings, Costco also sells a variety of colorful gemstone jewelry. One of the most expensive rings is a radiant-cut pink-diamond platinum halo ...