The term 'Diamond Who Went Platinum' refers to Neil Diamond, an American singer-songwriter and actor. He has sold over 100 million records worldwide, making him one of the world's best-selling artists of all time. He has had 37 songs reach the Top 10 on the Billboard Adult Contemporary chart, making him the most successful adult contemporary artist ever on that chart. His 1976 album 'Beautiful Noise' went platinum, making him the first artist to have a diamond-certified album.