Diamonds backed: a flawless supply chain includes precious security for cargo's most valuable shipments.(North America)

Diamonds are forever unless, of course, they are stolen. That's why the nation's 33,000 jewelry shippers and the companies that insure some of the world's smallest and most valuable air freight shipments are taking new steps to ensure that the stones that are so precious to thieves remain a girl's, and a consignee's, best friend. While the rest of the air shipping world is focused on security of another kind, jewelry businesses are reporting significant success in reducing theft in one of the cargo businesses most prized, and most targeted, commodities.

Industry experts say the improvement is d result of closer attention to transportation details, closer monitoring of goods in …