IBU - PAIR OF ARTIST'S EARRINGS in yellow gold wire (750 thousandths) forming a spiral ending with a dark gray round cultured pearl. Signed IBU Diam. 7.8 cm - Gross weight: 13.06 g. Irena Borzena Ustjanowski (1948-2002), better known as IBU POILÂNE, is an American designer of Ukrainian origin. An architect, she designed jewelry with particular attention to materials and balance. She worked notably for Karl Lagerfeld, who presented her creations at the Chanel Haute Couture shows in 1998, 1999 and 2000. She passed away in October 2002, and her work and vision of art are presented at IBU Gallery, located on the edge of the Palais Royal gardens in Paris.