The picture you are describing is known as the plotting diagram or simply the plot. It’s intended to be a map for locating various attributes of the stone when examined under magnification. Right below the drawing should be a chart that gives a token explanation of what each of the varoius marks mean. The face up drawing should contain all of the features that are visible within the stone when viewed in the face up position. The back view should contain anything that is visible from the back that isn’t already noted in the other picture. If you see something on the back, but not the front, this should be visible only from the back. If it appears on the front, it may also be visible from behind.
It’s worth noting that this is a map, not a rendition of the diamond. The amount of ink used isn’t really the point. In drawing these pictures, it’s usually appreciated by the dealers to have a pretty light touch with the pen because customers flip out if there’s a lot of red in the picture. Most of us learned in elementary school that red marks on your paper are BAD. The thickness of the line and the saturation of the red color aren’t part of the program. Similarly, they don’t always illustrate everything in the stone. The plotter should include the ‘grade setting’ inclusions, which are the ones used in the decision to assign a particular clarity grade and they should include anything that will be useful in recognizing the particular stone but others are optional.
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