The term 'diamond feature' is a collective term that refers to the four characteristics of diamonds: HARDNESS, HOME, FACET, and homeplate. HARDNESS is a measure of how resistant a diamond is to scratching and other forms of wear and tear. HOME is the place where diamonds are mined, usually in Africa or India. FACET is the flat surface of a diamond, which is cut to create its unique shape. Homeplate is the base of a diamond, which is the part that is held in place when it is set in jewelry.