Robert Marin, who owns the LAX Jewelry Co., has filed a police report claiming he went to Las Vegas last weekend (02-03May15) to sell the hip-hop star a pricey watch and chain, but the deal turned ugly and he alleges 50 Cent's entourage attacked him and took the items without paying, according to TMZ.com.

Cops in Sin City have launched an investigation into the incident, but 50 Cent's lawyer, Scott Leemon, is adamant the jeweller's claims are not true.

He says, "On behalf of 50, I can adamantly deny that he or his security had anything to do with these baseless and false allegations."