Sourcing manufacturers to reduce costs for a jewellery manufacturing company

We are looking to outsource our jewellery manufacturing process to reduce costs in the process. Looking for jewellery manufacturers who can work in long-term where they are able to provide high quality work and are reliable with their service. Preferably looking for manufacturers who can print 3d models, cast and finish the product either with setting gems or leaving it blank for stones to be set. Looking for manufacturers in india,china,hongkong or the likes where costs can be reduced. Products will be shipped to U.K. so that would need to be considered.