Symmetry is graded from Ideal / Excellent, Very Good, Good, Fair, or Poor. Symmetry grades of Good or higher have the least effect on the brilliance of the diamond and are suitable for the finest quality jewelry
The height of a gemstone, from the culet to the table. Depth % is the height of the diamond as a percentage of the girdle diameter
It is quite rare for fluorescence to have any visual impact on a diamond's appearance, and it does not compromise the gem's structural integrity in any way
Canadian diamonds almost always have none to slight fluorescence.