The shape of the center diamond is another part of an engagement ring that is subject to trends.
Years ago, Marquise shaped diamonds were very popular. Then there was a time that Emerald shaped diamonds were popular. Round diamonds have been very popular, because they are the most sparkly when cut properly. However the diamond shape that I see being the most popular today is “The Princess Cut”.

At times, we sell more princess cut diamonds than any other diamond shape, including rounds. There is no doubt that round brilliant diamonds have always been the top seller, but Princess cut diamonds have got to be right up there. I don’t know if it is just the name “Princess” (what bride doesn’t want to be a princess on her wedding day?) or if it’s because many women are just sick of seeing round diamonds everywhere.
I do think there is a little bit of mystique to the Princess name in a diamond that dates back to her childhood fairy tales, but I could be wrong. So to recap. Round diamonds have always been popular and remain so today, but The Princess Diamond is certainly the newest engagement ring trend in diamond shapes.