Famous Jeweler Declares War on Tyga, Asking Where's My $200k??

Tyga may have opened the floodgates when he paid a fat settlement to an old landlord -- 'cause a celebrity jeweler was paying attention ... and hired the SAME LAWYERS to collect on his $200k debt.

The man with the vendetta is Jason of Beverly Hills -- who claims he got screwed out of some serious cash when Tyga stiffed him in a 2013 jewelry deal for a sick watch and chain.

Jason went to court and got a $200,000 judgment against Tyga -- but he hasn't seen a single cent and was getting sick and tired of chasing his cash.

That is ... until he saw Tyga coughed up a huge settlement last week to an old landlord who was ALSO going after the rapper for an old debt.

So, Jason says he called the landlord's attorneys -- Danny Abir and Boris Treyzon from Abir, Cohen, Treyzon, and Salo -- and hired the guys to do the same thing for him.

We're told the team plans to use the exact same playbook -- aggressively going after Tyga and his assets and turning up the heat to collect ASAP.