From Gwen Stefani's $500,000 sparkler to Mariah Carey's 35-carat emerald-cut diamond, here are the most expensive celebrity ...
In October 2013, Kanye West (who now goes by Ye) proposed to Kim Kardashian with a 15-carat, cushion-cut diamond ring designed by Lorraine Schwartz that was estimated to cost upward of $3 million ...