According to Andrew Brown, CEO of New York City-based luxury buying company WP Diamonds: “Green diamonds are indeed extremely rare. Not quite as rare as pink diamonds, but, the intense and vivid greens found to date have been smaller than pinks we have seen.” While the exact shade of the sparkler isn’t easy to see, Mobley guesses it’s a fancy vivid green. “The exact color grading of the diamond has not been disclosed, but it is clear in the photos that it is exceptional and among the most rare.”