R.I. Couple Finds Rare Pear in Clam Fri Dec 23, 9:06 AM ET A clam that a Portsmouth couple thought was rotten turned out to hold a rare gem: a purple pearl that could be worth lots of money. It happened earlier this month when Barbara Krensavage brought home about four dozen quahogs from a Newport seafood restaurant. Her husband, Thaddeus or "Ted," was shucking them when he came across one he thought was diseased. Upon closer inspection, the couple found the pearl. "We're finding out there's only a handful on earth," Barbara Krensavage said. "We were excited, biting it...