Hawaii Five-O S02 E25 Kiss The Queen Goodbye

"Book 'Em, Danno!"

Camilla Carver, a con-artist, blackmails a politician to take her to an event where she can steal the priceless Queen of Polynesia emerald and swap it for a fake. However, McGarrett and the team are at the event and make sure that neither the gem, Carver or her accomplice vanish.