Insurer Allianz Global sued Hilton on Wednesday. Her spokeswoman says only costume jewelry was recovered by police.
The Munich-based insurer says jeweler Damiani lent Hilton the gems in 2007. The lawsuit says the Damiani jewels were taken along with about $2 million worth of other jewels in the December 2008 burglary.
Police returned a Louis Vuitton bag full of jewelry to Hilton after making arrests in 2009. The suit says Hilton then ignored Allianz' requests to return the Damiani gems.
Five people still face charges in the break-in.
