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Attending off-Broadway show Stomp with her son Liam in NYC on Monday, Calista Flockhart brightened up the Big Apple -- with a dazzling new rock!

Flockhart wed longtime love Harrison Ford June 15 in Santa Fe, New Mexico. And while the Governor's Mansion affair was low key, her new wedding ring is anything but.

Jewelry and style expert Michael O'Connor tells "The ring appears to have a 4-5 carat emerald cut diamond embedded in a collar of pave set diamonds, on a high-polished band, most likely in platinum."

The estimated price tag? $125,000.

"This style mixes classic (with a high polished platinum band), and modern (with the pavé diamonds)," O'Connor adds.

Flockhart, 45, and Ford, 67, dated for more than eight years before their intimate nuptials in Santa Fe, where Ford is filming Cowboys and Aliens. The couple are both parents to Liam, 9, whom Flockhart adopted as a single mom in 2001. "Harrison is so in love with Liam," a source tells Us. "They're such a sweet family."