Memorabilia dealer, Moments In Time, is selling Tupac's pendant -- dented by a bullet during the shooting in NYC 2 years before his death -- in a fixed-price sale for $125k.
M.I.T. owner Gary Zimet tells TMZ ... it was worn on a chain around Pac’s neck when he was shot.
Tupac’s family member gave it to them to sell and will receive a majority of the profits.
Important note, though ... we reached out to Tupac's estate, and they are strongly against this sale.
They tell us ... no one has the authority to sell any Tupac item -- not even family members. We're told they'll file suit against anyone who sells an item ... and go after anyone who buys one, too.