The main reason pinpoints and graining is not plotted is that many are virtually invisible even under 10x magnification, but if they were to be plotted, they would loom very large and way out of scale in importance in the plot or you would need a microscope to see the plot markings.Rather than make the diamond look poor because of a drawing, the comments are used to indicate that extremely tiny, yet possibly numerous inclusions are in the stone that cannot be realistically drawn due to both the limitations of the computerized drawing programs being employed and the limitations of the human eye to see correctly drawn microscopic inclusions.I hope that makes sense to you. Comments are seen to be negative, but actually there is a very positive twist to having inclusions so small one cannot draw them. ------------------
David Atlas
Accredited Gem Appraisers