The term DIAMOND, E.G. can be broken down into several crossword solutions: RHOMB (5 letters), SHAPE (5 letters), STONE (5 letters), GEM (3 letters), CARD (4 letters), and GEMSTONE (8 letters). A rhomb is a four-sided SHAPE with all sides equal in length and all angles equal. It is also known as a diamond SHAPE. A diamond is a precious STONE that is often cut and polished to be used in jewelry. It is the hardest natural substance known to man and is composed of carbon atoms arranged in a crystal structure. A GEM is a precious or semi-precious STONE that is cut and polished for use in jewelry. A CARD is a playing CARD with a diamond symbol on it. A GEMSTONE is a precious or semi-precious STONE that is cut and polished for use in jewelry.