diamondshaped

Diamond-shaped is an descriptive term used to describe objects whose silhouette resembles a diamond. In geometry the term often corresponds to a rhombus, a convex quadrilateral with four equal sides and opposite sides that are parallel, i.e., a parallelogram with all sides congruent. In a rhombus, the diagonals intersect at right angles, bisect the vertex angles, and bisect each other.

Area and measurements: The area of a diamond shape can be computed as half the product of its diagonals: area = (d1 × d2)/2. If the four sides have length s, then the perimeter is 4s. A square is a special rhombus with angles of 90 degrees, and a square rotated by 45 degrees is the classic diamond silhouette.

Uses and occurrences: The phrase is used in design, fashion, playing cards, the diamond suit, heraldry, and road signs. In jewelry, "diamond-shaped" can describe a lozenge-shaped gemstone or cut, such as a lozenge cut or the lozenge-shaped outline of some settings.

Relation to other shapes: Although most diamond shapes are rhombi, in everyday language not every diamond-shaped object is a perfect rhombus; the term is often used loosely to describe any quadrilateral that resembles a diamond.