That is one very heavy necklace Rhianna is wearing. I'm thinking some had to be plastic for her to be able to wear them for any length of time. Last halloween I dressed up as a Pearl Queen with lavender, black, white, 100 in strands and several more 42 and 60 inch strands loved the look but after about one and a half hours my neck was hurting because of the weight of the pearls and I had to start taking some off.