From the same as agol; something round, i.e. A ring (for the ears) -- earring.
see HEBREW agol
H5694. agil
עָגִיל noun [masculine] hoop, ring; — absolute ׳ע Numbers 31:50 probably ear-ring ( + טַבַּעַת, etc.); plural אָזְנָ֑יִךְ עַלֿ עֲגִילִים Ezekiel 16:12 (+ עַלאַֿפֵךְ נֶזֶן nose-ring).