Are my pearls worth anything?

by Karen
(Hugo Mn USA)

Purchased these pearls from Goodwill for

$4.99. They are cool to the touch, knotted between each, gritty when run across teeth, golden in color. Drilled holes are not ragged. Clasp is stamped "Japan". When held to the light I cannot see through them nor can I see the nucleus. I am assuming they are real but cannot tell if they are cultured or natural. Please assist.

Thank you,
Karen