The blister pearl makes it a good value. They are grown in saltwater Pteria penguin shells. The rest are inexpensive Chinese freshwater pearls. Looks like you could have some fun re fashioning them.
All the dark pearls are dyed as well as freshwater. Nothing wrong with that. They are real pearls and will last a long time. But they are definitely not akoya A tip is to check some of the larger websites here, such as Pearl Paradise, and take a look at what what different kinds of pearls look like at what they cost.