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

Princess Catharina-Amalia of the Netherlands dazzled in a tiara she once played dress-up with as a child. The 21-year-old ...

Chip Clark The Blue Heart Diamond, cut from a 100-carat stone found at the Premiere Mine in South Africa in 1909, had several owners before being donated to the Smithsonian by Marjorie ...