Demi Lovato's Engagement Ring Worth at Least $2.5 Million, Over 10 Ca

If Demi Lovato's engagement ring looked expensive, that's only because it's worth more than $2 million, and comes with some razzle-dazzle too ... TMZ has learned.

Sources with knowledge tell us ... Demi's ring would cost the average Joe off the street anywhere between $2.5 million and $5 million -- and that's due to the fact that it's a very special cut from a very well-regarded celebrity jeweler in Hollywood ... Peter Marco.

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