Can you tell which is a real diamond and which is a cheaper gemstone?

Just in time for Valentine’s Day, TODAY national investigative reporter Jeff Rossen reveals a new way to save big money on jewelry: a gemstone called moissanite. It costs a small fraction of what a diamond does, yet in side-by-side comparisons, most people failed to tell which was which. Watch what happens when Rossen puts Matt Lauer and Sheinelle Jones to the test.Feb. 13, 2017