Robert Buys Kristen $17,000 Diamond Promise Ring!

Rob proves he is serious with Kristen by picking up some serious jewelry — could a wedding be next?

Robert Pattinson and Kristen Stewart's days on set may be coming to an end now that Breaking Dawn is set to wrap, but the two are getting closer than ever! OK!reports that Rob picked up a "promise ring" for his lady love! "The ring is rose-cut diamonds set in rose gold," says a friend. "It's a very feminine piece of jewelry and very old." Awwwww!

The friend goes on to say, "The diamonds aren't huge, and it doesn't look like an engagement ring." The $17,000 antique ring was bought through someone who specializes in estate jewelry, and Rob knew Kristen would love it.

"Rob is more mature than Kristen and and he's ready to settle down," says an insider.

So what do you think HollywoodLifers — is marriage next for Rob and Kristen?
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