Hi Cubbie --- This company, Discount shipping insurance will insure valuable jewellery one off or multiple consignments seperately to the courier, that are sent by FedEx, although I can't find prices or limits as specific details are needed, but if you input your details they will quote you providing it is sent via one of the couriers that they recognise, FedEx is one of them along with DHL, UPS, USPS
http://www.dsiinsurance.com/