The bottom necklace is clearly made by folding into four one long strand of pearls and by attaching a ribbon.
I cut my pearls in half (so that I could make two necklaces that were less showy). I then attached thin ribbon to each end. This is really easy and neat for the side that has been folded in half but more awkward for the side which has two cut ends. Here I tied and wrapped my ribbon around each strand just before the last peal. I then tied another ribbon in a bow over the pearls that were sticking out and Voila!
Have fun with pearls and ribbons and let me know how yours turns out.