Emerald-cut diamonds are the top choice for celebrities getting engaged in 2017, said Rapaport.
Analysts studied 100 celebrity proposals of the past few years, from Kate Middleton, Duchess of Cambridge, to reality-TV personality Kim Kardashian, looking at cut, carat, metal and style.
“The oval-cut diamond was a celebrity favorite in 2013 and 2014,” the report by online jewelry retailer 77 Diamonds said. “Since then, emerald has been the fashionable go-to. While diamonds last forever, it seems metal and cut change with the times.
Yellow gold is the most popular metal for stars’ engagement rings in 2017, replacing white gold, which was the number-one choice in 2016. Platinum was the top option between 2013 and 2015.
Celebrities have been spending much more on diamond quality than in previous years. The average ring cost reached $1.29 million (GBP 1 million) in 2016 for the first time.
Meanwhile, the more often a celebrity has been married, the more they will spend on that special ring, the data shows. Where both celebrities have been married before, the average ring value is $3.5 million (GBP 2.75 million). The average ring value for celebrities on their first marriages is $584,576 (GBP 453,300).
First-timers spend an average of three years together before getting engaged, the report said. In contrast, where both partners have been married once before, it takes 28 months for the man to pop the question. For couples in which only the proposer is approaching a second marriage, it takes them just 14 months to get engaged.