These are porcelain, matte, unglazed, but built up with layers coloured with ceramic body stain -very trendy in the 80s, and tough rather than fragile. not quite the same as the swirled agateware discs in a previous image...

the curved brownish beads with pale cross designs are 3.5 cm long=1 ½ inches-
the attached name: made by Brenda Pegrum

trendy stuff in the 1980s-