The diamond's unique cut
Since the 1950s, the 4Cs have been the international standard for diamond grading. Diamonds are examined manually by professional gemologists in gem labs worldwide, and graded against standard grading scales. With the exception of cut grading, which is measured via computerized technology pioneered by Sarine in the 1990s, the 4Cs grading may be subject to individual perception.
If beauty is in the eye of the beholder, then two people will have two different experiences of a diamond's visual beauty.
