Box by Currey and Company from the Jossa Aventurine Box collection in Natural finish The Jossa Aventurine Box is made of banded aventurine, a material that looks strikingly similar to agate. The dynamic pattern is created when stone is mixed with composite in sheets. These are cut and the pieces are assembled into the flamboyant ivory decorative accessory. Designer Aimee Kurzner continues her material exploration in boxes with this set of contemporary accessories. Not that the surfaces will vary from piece to piece.