That depends on what you mean by "diamond shape." In a general shape, no, the sides need not be exact. If the shape is distinctly called a "rhombus," then mathematically speaking, yes, all sides must be equal, per the definition of a rhombus.
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pentagon
It's called a rhombus, and it is any 4-sided shape in which all 4 sides are of equal length. Examples are a square or a diamond.
Any regular shaped polygon has equal angles and equal sides
A hexagon has all six sides in equal length and all angles in equal measure.
A scalene triangle