My wife purchased a ring at Columbian Emerald at the cruise ship terminal. We were told the sold the ring at half price $ 1899 instead of approx. $ 3700, which the price tag said.
Back home we went to a jeweler store to have the price confirmed by an expert, and anticipated it would then be worth something like $ 3000; big mistake, it had a value of only $ 2150.
I guess the world wide guarantee is worth nothing as long as the price paid is a little less than the price back home.