One of those designers is Hella Jongerius:
Source: Royal Tichelaar Makkum, Hella Jongerius
One of the other projects is by Alexander van Slobbe, Pearls of Makkum.
I liked these from the beginning and some time ago my parents surprised me with a large black pearl! Maybe, some day, I will collect a few more to make a string of pearls like these...
Source: Royal Tichelaar Makkum, Alexander van Slobbe
But they also worked with designers like Studio Job, Marcel Wanders and Roderick Vos.