First of all, you may have used a beauty camera and chosen the best angle. In addition, the post-10 P-chart technology made the diamond flicker.

Secondly, another possibility is that it is a diamond certified by sarine Optical Performance Certificate. Now there is such a certificate to identify the sparkle of diamonds. The higher the grade, the brighter the diamond, and the degree of the diamond's brilliance is determined by the cutting. Perfect cutting makes the diamond more shiny.