Barack Obama was sworn in for his second term on Monday, marking another four years under the same Commander in Chief and presenting an especially momentous occasion for attending celebrities and politicians to flaunt their best jewelry.

Scroll down to see the jewels celebrities rocked for the inaugural events in Washington.

First Lady Michelle Obama wore Forevermark to the Inaugural Ball on Jan. 21, accessorizing with two of Kimberly McDonald for Forevermark’s diamond bangles (below) set in 18-karat oxidized gold.

Think Like a Man actress Gabrielle Union (below) wore Le Vian and Carrera y Carrera jewels to the Inaugural Ball hosted by BET Networks at the Smithsonian American Art Museum & National Portrait Gallery.

Union donned Le Vian’s 18-karat white gold earrings with vanilla diamonds ($29,748) and Carrera y Carrera’s 18-karat white gold Mosaico diamond pavé bracelet ($31,300) and 18-karat white gold pavé diamond, sapphire, tourmaline and garnet ring ($19,100).

Hotel Noir’s Rosario Dawson wore Graziela’s Pink is the Word earrings (below) to the 2013 Learn. Build. Create. Inaugural Celebration in Washington on Jan. 21.

Kelly Clarkson (below with fiancé Brandon Blackstock), who sang “My Country ‘Tis of Thee”  at the inauguration, wore DeLatori’s earrings for the event, made in sterling silver with 18-karat gold overlay and green amethyst ($695).

Singer and actress Jennifer Hudson (below) sang “Let’s Stay Together” at the Inaugural Ball, donning DeMarco’s 18-karat white gold mix diamond ring ($20,000).