Opening Ceremony of the London Olympics

The Queen, accompanied by the Duke of Edinburgh and other members of the Royal Family, officially opened the London Olympic Games.

I think this is the rule: you agree to "parachute" out of  helicopter, you can wear as many diamonds as you like. Yup. Sounds right to me.

Queen Adelaide's Brooch

Diamond Earrings, hard to positively identify

Smaller Diamond Collet Necklace

Photo:PA/BBC