Top Jewelry Manufacturers in Portugal. Mangla International is one of Portugal’s leading jewelry manufacturers & suppliers of handcrafted gold, artificial, oxidised, kundan jewellery and 925 sterling silver jewellery etc. Specializing in white-label custom jewelry and bespoke services for jewelry brands with MOQs starting at just 50pcs. Wholesale Jewellery in Portugal – Visit Mangla International online jewelry shopping store in Portugal for your engagement & wedding rings, earrings, bracelet, necklaces. Latest silver & gold jewellery design collections online. Buy gold rings, gold earrings & more.