A diamond shape is a geometric figure with four sides of equal length and four angles of equal measure. Common terms for diamond shapes include LOZENGE (7 letters), rhomb (5 letters), RHOMBUS (7 letters), teardrop (8 letters), PEAR (4 letters), and OVAL (4 letters). LOZENGE and RHOMBUS are both diamond shapes with four sides, while rhomb has four sides of unequal length. Teardrop and PEAR are diamond shapes with curved sides, and OVAL is an elongated diamond shape.