On Monday, Kim Kardashian celebrated her birthday in San Francisco with her boyfriend Kanye West, who rented out AT&T Park, where the Giants play, and had an orchestra play as he proposed to her. She said yes, and she posted a picture of her diamond recently on Instagram.

According to Radar Online, it's a 15 carat Lorraine Schwartz, which is also smaller than the ring Kris Humphries gave her previously, which was a 16.2 carat emerald cut, surrounded by 1.8 carats of side diamonds, also designed by Lorraine Schwartz.

Since I'm not an expert on how expensive diamonds are, I gave A&A Jewelers a call to find out how much your average 15 carat diamond is.

There's rumors that the ring could be worth $2 million, or even as high as $8 million. I would've just settled for "a lot."

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