Seguso’s Bitta & San Fantin glass knobs – http://seguso.com/?portfolio=bitta  (Italy) /

Du Verre: from the Pomegranate & Botero ranges https://duverre.com/collections/pomegranate (Canada) /

Ged Kennett Contemporary Metals: from their  Bespoke handles –http://www.gedkennett.co.uk/bespokehandles.html#! (England)