In September 2010, Zuckerberg invited Chan, who was medical student at the University of California, San Francisco at the time, to move into his rented Palo Alto house. Before moving in, she gave him a "Relationship Contract" which stated "One date per week, a minimum of a hundred minutes of alone time, not in his apartment and definitely not at Facebook.
He designed his wife's Priscilla Chan's wedding ring, which is a ruby flanked on either side by diamonds. The ring is reportedly worth $25,000, even though he was worth about $19 billion at the time.