Decide on the parameters of the rhombus. These include two characteristics: the length of each side (the same for all four sides), and the size in degrees of one of the angles. For example, you may decide to construct a rhombus with a side of 5 inches and one angle of 45 degrees.
Draw the base of the rhombus in pencil. In the example, you would draw a base line of 5 inches. Label the endpoint on the left "A," and the endpoint on the right "D."
Draw a guide for the second line of the rhombus. Use the protractor to measure a 45 degree angle at point "A," measuring the angle up from the base line. Use the ruler and pencil to draw a second line, beginning at point "A," at an angle of 45 degrees; you may go out beyond five inches at this stage.
Draw the second line of the rhombus. Use the compass to draw a small curved line segment, 5 inches out from point "A," intersecting with the guide for the second line of the rhombus. Label the point of intersection "B," and draw the final form of the second line of the rhombus, from point "A" to point "B."
Determine the position of point "C" of the rhombus. Use the compass to draw a curved line segment, 5 inches out from point "B," out towards the right, and then use the compass to draw a curved line segment, 5 inches out from point "D," up and to the right. Label the point where these two curved line segments intersect as point "C."
Using the ruler, draw in the line segment from point "B" to point "C," and the line segment from point "C" to point "D." Your rhombus is complete. Erase any remnants of guidelines.