First published in 1845, Tiffany and Co.’s Blue Book is a catalogue of the jewelry house’s most valuable and rare couture designs. And who better to model them than the likes of Reese Witherspoon, Noami Watts, Jessica Biel and Diane Kruger? That’s exactly what they did at the Blue Book Gala on Friday night, where Witherspoon sported a $10 million diamond necklace with her J. Mendel gown inside the Cunard Building (also known as the home of Victoria Beckham‘s fashion shows). Kruger’s aquamarine, tanzanite, green tourmaline and diamond necklace, by contrast, only cost $525,000. Talk about playing favorites. Of course, all of the jewelry was returned at the end of the night so that prospective buyers could begin bidding the next day. Even the A-listers have their Cinderella moments.