You can try to search for something like it on eBay and look at what sold and at what price. It doesn't look like very good quality and some of them don't look like pearls so maybe your best bet is to sell in bulk as 'arts and crafts' materials.
These are bad quality, and some don't even look like pearls. I don't think they're sellable for jewelry. Maybe sell them in bulk as fish tank gravel, or for vases to make flowers stand up?