Hi ladies! I am interested in purchasing a strand of pearls but just wanted to know what the usual length is, 16" or 18"? I am also looking at the Pearls - Pearl Jewelry Store - Pearl Necklaces and Earrings - Akoya, Tahitian and Freshwater Pearls site and I was wondering how reasonable the prices are. I've purchased Akoya pearl studs from them before and they look great but I don't know how much pearls should cost. Thanks!