I am not an expert, however, IMHO, the ones in the first pic early rice pearls as in Cultured Fresh Water Pearls (CFWP).
The ones in the second and third photo are too uniform and clean to me for them to be real, and I shall guess they are faux pearls of some sort.
I shan't be able to put a price on them, however in the early 90s, I was able to buy strands of rice pearls for jewellery making purposes for less than 5 GBP for this quality.