Antoine Walker -- NBA Championship Ring SOLD in Bankruptcy Case

Antoine Walker's NBA Championship ring just sold for $21,500 ... which would have been great news for Antoine, if he wouldn't have been FORCED to sell as part of his bankruptcy case.

Walker -- who won the ring as a member of the 2006 Miami Heat -- filed for bankruptcy back in 2010 ... claiming he racked up more than $12.7 million in debts ... but had only $4 mill in assets.

According to court docs, Walker had to liquidate his property to pay back his creditors ... including his ring. Now TMZ has learned, the ring has been tentatively sold to a guy named Andres Garcia for a cool $21,500.

A judge needs to sign off on the deal before any money changes hands ... but we're told it's pretty much a done deal.