Sandra LMT
Welcome! Please give us some additional history on your pearl necklaces. When acquired and where; that sort of thing. The photos are a little out of focus to see blemishes, which are often an additional clue to the type of pearl. Perhaps you could take a couple more photos. If using a camera, use the flower setting to get really close to a section.
Yes, you do have genuine cultured pearls, and very pretty, wearable necklaces! The bottom strand is likely freshwater, the top necklace could be baroque akoya.