What is the real name for the shape a diamond?

The real name for the shape of a diamond is "rhomboid," specifically when referring to a two-dimensional geometric shape. However, in the context of gemstones, a diamond is typically cut into various shapes, with the most common being the "brilliant cut," which features a round shape with numerous facets to enhance its sparkle. The term "diamond" itself refers to the crystal structure of the mineral, which is a form of carbon.