Engagement rings for the rich and famous are often extraordinarily lavish displays of wealth and affection. Some of the most impressive engagement rings included Heidi Klum's 10-carat canary diamond presented on a glacier, Jayne Mansfield's $25,000 10-carat round diamond ring in the 1950s, and Jacqueline Kennedy Onassis' 40-carat diamond ring from Aristotle Onassis valued at $2.6 million.