Rapper Tyga is rolling around town with some sick jewelry — a diamond watch and chain worth more than $91,000 — but problem is the bling isn’t his according to a lawsuit filed by a famous Beverly Hills jeweler.

In the suit, Jason of Beverly Hills claims the rapper agreed to drop $28,275 for the jeweler’s diamond pantheon watch back in August, 2012.

He also claims Tyga borrowed a $63,000 diamond Cuban link chain in December, 2012 — but never returned the piece.

Now Tyga is being sued for the cost of both pieces, plus late fees … which just about doubles his tab to a whopping $185,306.50.