Offset Cardi B Dropped Quarter Mil On My Trap House!!!

2/24/2018 12:10 AM PST

Offset's Trap House Chain from Cardi B Worth $250k

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Cardi B just bought Offset a brand new house ... made out of diamonds, but this crib fits around his neck.

Cardi was busier than we thought over NBA All-Star weekend 'cause she dropped $250k on a pendant covered in 150 carats of diamonds. We're told Cardi ordered the "Bando" (that's abandoned house if you're not down) from celeb jeweler Elliot Eliantte. The piece is ridiculously detailed -- complete with graffiti, an oven and 2 figurines of Offset ... both of them armed!

We're told Cardi wanted to give it to her fiance for Valentine's Day, but they weren't together until they hooked up in Los Angeles last weekend.

BTW ... Avianne is where we frequently see rappers -- like the Migos guys, 2 Chainz and more -- shopping in NYC.