After cashing in with Facebook's IPO, Mark Zuckerberg's bank account ballooned to a robust $20 billion, but Zuck's multi-billion dollar pay day might not have even been his biggest milestone in the past week. The very next day, the Silicon Valley tycoon quietly tied the knot with longtime girlfriend, Priscilla Chan, in Palo Alto, California. 

Sitting on that much cash, you'd think Zuck, who shies away conspicuous consumption, would break the bank on an extravagant wedding ring for his wife. Nah, the wealthy CEO opted for a modest ring with a ruby centerpiece, which he designed himself. 

We don't think Zuck is hip to the old adage: "Diamonds are a girl's best friend." Maybe the upgrade is on its way in standard shipping? 

[TMZ]