Articles about Diamond Grading
To the naked eye a D Flawless diamond can appear identical to an F VS diamond if each has been cut the same way. Alternately, less than one degree of variation in two diamonds’ facet measurements can make a noticeable difference in appearance - yet both could be issued the same cut grade from a given lab.
Consumers’ Problems and a Solution
By Sergey Sivovolenko, Janak Mistry, Garry Holloway and Dr Yuri Shelementiev
On many websites you will see it said that the pavilion main facets drive light return. Top labs and many grading systems use the pavilion angle as a basis for assigning a cut grade.
Is this correct?