Cups sandstone cups pyrité Gustave Tiffoche, La borne 1960/70

These 6 pyrite sandstone cups were made in la borne in the 60s and 70s by the art ceramist gustave tiffoche, who signed them in hollow below and sometimes on the base. They have a raw appearance with pyrite inlays, which contrasts with their slender line. They can be diverted into decorative pots, small vases, ect. They sometimes have cooking imperfections that also make the nobility of these pieces. Note, one has a small lack of enamel at the neck (see last photos with 2 cups).