Board Thread:General Discussion/@comment-26337259-20150423223140/@comment-26812261-20150427042949

I think if there was only one diamond they wouldn't have specified "Yellow Diamond". Plus, the gems depicted in the murals have large, diamond-shaped gems in their chests, and Steven just happens to find two large, diamond-shaped gems throughout the series, one white, and one blue. Inclined to think there are three different ones, myself.