Clarity Plots and Comments

A comparison of the diamonds and the plots from all three labs showed that AGSL
report plots had a consistency and greater degree of detail than the GIA-GTL
reports. The plots of the EGL USA documents were close to the quality of AGSL
and contained adequate detail. See Appendix V.

GIA-GTL made the most use of comments (12 clarity or surface feature comment on
a total of 18 reports), followed by AGSL (10 such comments on 16 reports),
however EGL USA made none. GIA-GTL’s stated practice is to plot only the marks
that set the clarity grade, with others often being referred to in the comments
section; this policy was reflected in the absence of a few inclusions which
were reported in the comments section. GIA-GTL plotting was also somewhat less
intensely drawn.


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