25 grams of Jack-bean (Canavalia rosea) or about 30 seeds, not pierced.

Details

beach bean, bay bean, seaside jack-bean, coastal jack-bean and MacKenzie bean,

These marbled seeds are about 14mm in length, they turn brown in the sun and their use in jewelry requires a certain vigilance because of their toxicity in case of ingestion.

C. rosea inhabits upper beaches, cliffs, and dunes throughout the world's coastal tropics. It is highly salt-tolerant and prefers sandy soils.