Figure 1. The 127.01 ct Portuguese diamond was graded by GIA as M color and VS1 clarity (A,B) with very strong blue fluorescence (C); photos courtesy of the Smithsonian Institution. The Portuguese diamond has been cited as a classic example of a stone being “over blue” and exhibiting a noticeably oily or hazy appearance (D). It is also shown being worn by American actress Peggy Hopkins Joyce (E). Photos by NMNH Photo Services (A), Chip Clark (B), and Harold & Erica Van Pelt (D).