if you've never been, go to Cape May, New Jersey. search the pebbles on Sunset Beach (a.k.a. the "Pebble Beach" ) and search for a Cape May diamond. if you don't find one at least you will see an amazing sunset.
Cape May Diamonds / Not diamonds, but quartz tumbled in the sea. The Kechemeche Indians, a part of the Lenni-Lenape tribe, believed the gems had supernatural powers to influence the well-being and good fortune of their possessor and gave them as Sacred tokens of friendship