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

From Jennifer Lopez's pink engagement ring to Kim Kardashian's 15-carat stunner, read on for a roundup of some of the most expensive celebrity rings of all time.

Museum in London features Queen Elizabeth's 23.6 carat pink diamond brooch and Princess Grace of Monaco (Grace Kelly)'s 10.48 ...

The ring in question: a 5-carat black diamond by Itay Malkin ... When it came to designing her own engagement ring – which she did unknowingly – Kitty naturally gravitated towards pink sapphires, ...

Her engagement ring—which she paired with a Welsh gold wedding band, a marital tradition for the royals—features a rare pink-orange padparadscha sapphire as its centerpiece with a diamond ...