Answer :

Ematio
You get a parallelogram and possibly a hexagon. It all depends on the size of the diamond.

The correct answer is:

A parallelogram.

Explanation:

In geometry, diamonds are known as rhombi. A rhombus is a parallelogram that has all 4 sides congruent. Laying 3 of these edge to edge we can form a parallelogram; we will have 2 long sides (the length of 3 sides of the rhombus) opposite each other and 2 short sides (the length of the side of the rhombus) opposite each other.