FIG. 16 in The exploitation of molluscs and other invertebrates in Alexandria (Egypt) from the Hellenistic period to Late Antiquity: food, usage, and trade

FIG. 16. — Fragments of pearl oyster (Pinctada margaritifera Linnaeus, 1758) from the Hellenistic period: A, one of the shells displays traces of red/violet pigment (with an observation through binocular microscope); B, the second is unworked; C, the third is polished. Scale bars: 10 mm.