a flawless ideal cut diamond is no more beautiful to the unaided human eye than a grade in the middle of the scale. Once again, extremely subtle differences in clarity are very important to determine rarity, but only affect beauty when in the very low end of the scale.
When anniversary rings are cut too shallow, light leaks out of the bottom, brilliance is lost and the diamond appears watery, glassy and lifeless.
The skill and accuracy of the diamond earrings cutter is crucial in bringing out the beauty and "fire" from the stones.