Designer Pierre Gimbergues has used ancient volcanic rock to create an opulent sofa that will be unveiled at Salone del Mobile this week.

Gimbergues worked with Peugeot Design Lab, the design division of the French automobile company, to create a furniture piece dubbed The Onyx Sofa. The sofa was described by Peugeot as the “static partner” of the auto company’s current Onyx collection, which includes a high performance supercar, a three-wheeled hybrid super…