Can we zoom in on that sparkler? Newt and Callista Gingrich in 2008. (Paul Morigi/ Wire Image)

Credit-card debt — nothing more American than that! A six-figure tab at Tiffany & Co.? Maybe a little harder for the average voter to relate to. Financial disclosure forms filed in ’06 and ’07 by Newt Gingrich’s wife Callista while she was a Hill staffer revealed that the 2012 GOP hopeful had a liability of between $250K and $500K from a charge account with the jeweler, Politico reported Tuesday.What does that kind of pain get you at Tiffany? Gingrich declined to tell our colleague Karen Tumulty what he purchased. Browsing their Web site, we found a rare “deep orangy pink” diamond ring for $325K. Or perhaps it was the leftover balance for something more ambitious, like the $675K 13-carat yellow diamond ring.