The young girl feared that the men would consider her family to be poor because their daughter was busily engaged in the menial task of husking rice. Being very intelligent, the shy girl broke the shell bracelets from her arms, leaving just two on each wrist.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सा तज्जुगुप्सितं मत्वा महती वृडिता ततः । बभञ्जैकैकशः शङ्खान् द्वौ द्वौ पाण्योरशेषयत्
sā tajjugupsitaṃ matvā mahatī vṛḍitā tataḥ | babhañjaikaikaśaḥ śaṅkhān dvau dvau pāṇyoraśeṣayat
SB 11.9.7