The precious stone known as the diamond can be any shape, depending on how it has been worked. It will be faceted (that is, it will have a number of smooth flat surfaces, separated by angles, which reflect the light and make it sparkle).
The shape known as the diamond is a plane of four equal sides. Two of its opposite angles are less than 90 degrees (for example, 70 degrees) and equal to one another, and the other two opposite angles are more than 90 degrees (for example, 110 degrees) and equal to one another.
rhombus
Square
A rhombus is just another name for a diamond. So therefore, a diamond shape.
I believe it is Rhombus
rhomboid; rhombus
a quadrilateral sideways, a pentagon looks like a crown.
you have two diamonds and a cross
a rhombus
Argyle
a rhombus
A diamond shape is also called a "lozenge".
A diamond is not a square, but a square is a diamond. A diamond is another name for rhombus.