Hi there Aleksa. Welcome to our forum!
Oh well...the photos are very blurry and out of focus as well...so, it makes it all much difficult but those don't look like Akoya pearls but seem more like low quality freshwater pearls.
That's a really cheap looking clasp and a poor knotting job. The clasp is about the only way you can claim Mikimoto origin and you still can't trust that because the clasp could be fake or the pearls swapped.