IBU, A FRENCH POLISHED TURQUOISE AND GOLD COLOURED DRESS RINGThe polished tapered turquoise panel with internal gold band, stamped IBU with French poinçon, and Ehret poinçonSize/dimensions: Finger size QGross weight: 20.1 gramsProvenance: from the collection of Victoria, Lady de Rothschild Irena Borzena Ustjanowski (1944-2002), or IBU as she was artistically known, was an American modernist jeweller and sculptor of Polish/Ukrainian descent, she tragically died in a helicopter accident in 2002, but her artistic vision is still encapsulated by the IBU gallery, located at the Palais Royal gardens in Paris.品相: There is a large chip to the bottom side of the turquoise panel, a few smaller chips and nibbles, the marks are fairly clear, some slight rubbing.