Don't get too hung up on brand names. If someone likes your necklace they like it and it doesn't matter what name is on the clasp.
I have never seen so many different size pearls altogether in one necklace though. What an eclectic mix of faux pearls!
Combinations of different colours of pearls in the one necklace are popular today, especailly in pearls of large sizes. Nancy Pelosi set a fashion trend with her multi-coloured south sea pearls. You can see Nancy wearing the pearls at this link.