A diamond is a 2D shape that is formed by two triangles placed together in a specific way. The shape of a diamond is often described as a rhombus, which is a parallelogram with equal sides. Diamonds have four equal sides and opposite angles that are congruent.

One of the unique features of the diamond shape is its **symmetry**. The shape has rotational symmetry of order two, meaning that it looks the same when rotated 180 degrees. This property makes diamonds popular for use in jewellery and as decorative accents.

The diamond shape was first used in India in the 14th century as a way to cut and shape natural diamonds for use in jewellery. Indian diamond cutters were among the first to recognize the unique properties of diamonds and how they could be shaped to maximize their brilliance and sparkle.

The diamond shape has also been associated with various cultures and beliefs throughout history. In ancient Hindu mythology, diamonds were believed to have magical powers and were associated with the gods. In medieval Europe, diamonds were worn by kings and queens as a symbol of wealth and power.

**The terms “rhombus” and “diamond shape” are often used interchangeably to refer to the same 2D shape. However, there is a subtle difference between the two:**

A rhombus is a quadrilateral (a four-sided shape) with all four sides of equal length. Its opposite angles are congruent (meaning they have the same measure), and its adjacent angles are supplementary (meaning they add up to 180 degrees). In other words, a rhombus is a parallelogram with equal sides.

A diamond shape, on the other hand, is formed by two congruent triangles joined at their bases. The shape has four sides of equal length and opposite angles that are congruent. The diamond shape is also a type of rhombus, but it is more specific because it is formed by two congruent triangles.

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