Marcel Tolkowsky, the grandson of Israel (Isidore), introduced the Ideal Cut diamond, a benchmark that remains prominent in the industry today.
[3] He acted as the Managing Director and Chairman of Diatrada, N.V., a division of De Beers for over 20 years and continued as their Worldwide Consultant beginning in 1995.
[3][8] This diamond remained untouched for over a year while the correct tools and technical conditions were created by Gabi and his team.
The gem was kerfed (hand cleaved) in order to avoid heat or vibration-related damage from using saws or lasers.
[10] During this time, Gabi Tolkowsky was again selected by the De Beers group in order to design and cut the Golden Jubilee Diamond.