A diamond has a complex structure. Initially, I attempted to draw it as depicted in the image, but the result was chaotic. I realized I wouldn't be able to remember how to draw it accurately. Consequently, I had to simplify the process, and then simplify it even further.
Here's the method I developed:
Draw the basic shape of the diamond: a straight top surface, followed by two lines extending to the sides, from which two more lines connect at a single point at the bottom.
Add a horizontal line at the junction of the sides.
Draw two central edges that diverge slightly and symmetrically to the sides, converging at the bottom point.
Finally, draw two side edges extending from the upper corners, also converging at the bottom point. These should be at a greater angle than the central edges.