Allison Williams looked as stunning as ever at the 2014 Vanity Fair Oscars Party on March 2, but we couldn't help noticing one extra-sparkly accessory!

The actress, who announced her engagement to Ricky Van Veen on Feb. 27, debuted her diamond ring during the event.

Allison wore a gorgeous, pink gown and kept her hair slicked back and simple. She really let the ring be the focal point of the look! The gorgeous rock is a classic cut and style, perfectly befitting the actresses' sophisticated tastes.

It's lovely!

Pascal Le Segretain, Getty Images