Sean Kingston Sued: We Gave You Bling, You Gave Us Bouncing Checks (PHOTOS)

Sean Kingston has no problem picking out tons of high-end jewelry, but paying for it is another story ... according to the high-end jeweler who says they got screwed.

NYC jeweler Aqua Master just sued Kingston over 9 pieces of jewelry he scooped up last month -- valued at more than $300,000. The jeweler says Sean promised his biz manager would wire money to pay his tab.

According to the suit, Aqua got 2 checks instead of a wire transfer ... and they bounced. Meanwhile, Sean was enjoying 2 diamond necklaces, a few gold chains, a ring, a bracelet and 2 watches. A rep for Aqua tells us Sean even flaunted the goods on IG.

The company is suing Kingston and his company, coincidentally named ... Time Is Money Entertainment.

This is old hat for Kingston, who was sued by a Florida jeweler in March, and also ordered to pay another NYC jeweler for an unpaid bill.

Sean's rep hasn't gotten back to us -- but on Raq Rants he explained why so many jewelers have beef with him.