The term 'DIAMOND PART' can be broken down into two crossword solutions: INFIELD (7 letters) and FACET (5 letters). Infield is a term used in baseball to refer to the area of the field between the pitcher's mound and home plate. A FACET is a flat surface on a cut gemstone, such as a diamond. Together, these two words describe the parts of a diamond that are cut and polished to create its unique shape.