Ol 'millet pearls' em ol gutpela 'natural pearls'. Ol pel em i wanpela ston bilong bipo tru, we ol i save painim long ol 'pearl oyster' na 'mother-of-pearl molluscs. Ol pel em ol 'calcium carbonate mineral beads' we 'endocrine system' bilong ol 'shellfish' i save kamapim, we i gat planti liklik 'aragonite crystals'. Ol i gat kain kain seip na kala.
