Aside of the main edition there are 3 artists proof pieces of the Star model, edited as follows: 22/21, 23/21, 24/21. (two demonstrators, turned from blocks of crystal acrylic, and one black pen). One of the demonstrators (23/21) is decorated in an identical manner as the main edition - with silver spots, the other demonstrator (24/21) and the black pen (22/21) are decorated with spots cut out from solid 14K gold plate.