A group of semi-precious stones comprising four obsidians, one of which is large (12 x 11 x 8 cm, 6.5 x 8 x 10.5 cm, 2 x 8 x 6 cm and 3 x 4 x 3.5 cm), a red jasper (5 x 12 x 12 cm) and a Mexican speckled obsidian (5 x 6 x 3 cm) (wear, chips).