The symmetry describes how well the facets in the crown are aligned with the facets in the pavilion. For both polish and symmetry, it is desirable to be good, very good, or excellent. Clarity Grade will be listed using the GIA grading scale. Color Grade will be listed using the GIA grading scale. Fluorescence is a description of how ultraviolet light affects the diamond.
Most fluorescence is blue, but other colors such as yellow, orange and green can appear.
Fluorescence can be a positive feature provided it isn't so strong that it makes the diamond look cloudy. Comments are provided for those features of a diamond that a laboratory wants you to know but do not fit in the other specific categories. Most comments are minor and do not impact the value of the stone. Plot of the diamond is the diagram of the internal inclusions and external blemishes as viewed with 10X magnification. The marks on the plot identify the location, size and type of flaws and very useful in documenting the identify of your diamond.