Posted by Barbara D. on August 21, 2014, 3:02 am, in reply to "Re: DOC jewel"
As others already stated, it's assumed to be this gift (taken from the List of Gifts 2003-2006, published by Clarence House) - not from one of the Gulf states, but from Saudi Arabia.
HRH The Duchess of Cornwall, Royal Family of Saudi Arabia, Three necklaces (parures) emerald, ruby, sapphire