Cullinan Diamond
The Cullinan Diamond is the largest gem-quality rough diamond ever found, weighing , discovered at the Premier No. 2 mine in Cullinan, South Africa, on 26 January 1905. It was named after Thomas Cullinan, the mine's chairman.
Yair Shimansky
The Brilliant 10 diamond design is a 71 facet round brilliant cut diamond design developed and patented by Shimansky. It's been stated as being the most brilliant diamond in the world. The diamond is currently the only diamond that has no light leakage, in which all of the light that enters through the table and the crown is reflected back. In contrast, a regular round brilliant diamond with 57 facets loses around 8%-12% of light even if cut to ideal proportions, in which the light loss is around the girdle area of the diamond.