Who made these earrings?

I have never seen earrings like this. They are Spiny Oyster and Onyx Inlay, I think. Does anyone know whose hallmark that is?

These earrings are manufactured. Does the piece have any other markings?

I know it’s been a long time, but these are from Silpada. The company has since closed, but they were very popular and sold jewelry through catalogs mostly.

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