The iced-out playmaker chain Deebo Samuel rocked during "Monday Night Football" is as incredible as it looked ... 'cause TMZ Sports has learned the details behind the piece, and it came with a 6-figure price tag!!
The 49ers wide receiver donned the massive chain during the 4th quarter of San Francisco's 31-10 win over the L.A. Rams ... after scoring his second touchdown of the game.
The piece -- made by Rafaello and Co. in NYC -- had social media talking .