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These stunning celebrity engagement rings show that a diamond, if not a wedding--is always. But engagement rings haven't always been all about the diamond: Roman brides were given an engagement ring in gold for public wear and an iron wedding ring to wear in the home. In the 1800s, plain poesy rings were very popular in Europe and in New England, Puritan men--shunning the frivolous rings--were believed to have given thimbles to their bridesmaids (though women were often cut the tops off and used them as rings). Then, in 1947, De Beers released its famous slogan "A diamond is eternal." The rest is history. Today, we have everything from Elizabeth Taylor's 33 carat diamond from Richard Burton to Meghan Markle’s diamond ring made from stones from Princess Diana's private collections to Hailey Bieber's stunning oval diamond from Justin. Below, you can find a wealth of inspiration for ring designs from the stunning diamonds worn by celebrities as well as royalty and celebrities.