The term DIAMOND GEM can be broken down into three crossword solutions: HOMER (5 letters), NOHITTER (8 letters), and NOHITGAME (9 letters). HOMER is a reference to the ancient Greek poet Homer, who wrote the epic poems The Iliad and The Odyssey. NOHITTER is a term used in baseball to describe a game in which one team does not allow the other team to get a single hit. NOHITGAME is a variation of NOHITTER, but it also includes no walks or hit batters. All three terms are related to the term DIAMOND GEM, as they all refer to something that is rare and valuable.