It is the curse of the lamp. All the power in the universe...and I am bound by the rules of the genie!
~ Genie Jafar about his Lamp.
Jafar's Lamp is a magical, black, brass oil lamp that belonged to the evil sorcerer Jafar after he wished to a become a powerful genie and it later became the prison of both Jafar and Iago (formerly).
Jafar's Lamp is identical to Genie's Lamp, the only difference is, it has a pitch black coloring and an upside down handle. And it has markings on it's opening lid that resembles flames, a trait shared by the walls of Jafar's Chamber.
At the end of the film Aladdin, Aladdin tricked Jafar into wishing he was an all powerful genie. Aladdin knowing he will be sealed into a lamp for eternity to do a master's bidding, holds Jafar's black would-be prison that appears once the wish is granted by Genie and it sucks Jafar (while pulling Iago) inside. Genie then sent the lamp far into the Cave of Wonders for 10,000 years.
The Return of Jafar
In The Return of Jafar, Iago managed to escape the lamp, but instead of releasing Jafar from it, he threw it down a nearby well, due to Iago having grown irritated that Jafar does not grant him credit when it is due, and instead used him (with Jafar also making the grave mistake of reminding Iago shouting "Polly Want a Cracker" that finalized Iago's decision).
Later, Abis Mal finds the lamp at the well and rubbed it, releasing Jafar. At the end of the film, Aladdin and his friends tried to capture Jafar's lamp so they could destroy it, which would thus destroy Jafar. In the end, a wounded Iago, having fully turned against Jafar, kicked the lamp into a lava pit and it melted away, causing Jafar to electrocute, then explode into nothingness, destroying him forever.
Appearances in other media
Another black lamp exactly look-like Jafar's own Lamp is seen in the episode "When Chaos Comes Calling of the Aladdin TV series as the Evil Genie's own lamp.
Jafar was pulled into a lamp once again by Mickey Mouse at the end of Mickey's House of Villains, except this lamp looked like the gold one that belonged to Genie.
Jafar's Lamp made an appearance in the Kingdom Hearts videogame series. It first appeared in Kingdom Hearts and appeared the final time in Kingdom Hearts II.
Jafar's Lamp (Part 1)
Genie Jafar's Lamp
Jafar's Lamp appears at his "Palace" after the evil sorcerer wished himself to be a genie.
Aladdin trapping Genie Jafar in his magic Lamp.
Aladdin allows Genie to get rid of Jafar's Lamp.
Genie about to flick Jafar's Lamp far into the distance.
Jafar's lamp sent flying across the desert.
Jafar's magic Lamp.
An artwork of the evil Jafar with the greedy Abis Mal holding his magic Lamp (miscolored as yellowish-gold).
Iago hears Jafar's voice while crawling out of his Lamp.
The yelling Jafar sends Iago blasted out of the lamp.
"DO AS I SAY, YOU WORTHLESS PIPSQUEAK!!"
Iago has finally had enough of Jafar's abuse.
Iago drops Jafar's lamp down the well.
Abis Mal empties some water on himself, and Jafar's lamp falls and hits him on the head.
Abis Mal finds Jafar's lamp and rubs it.
The frightened Abis Mal unknowingly releases Genie Jafar from his accursed Lamp.
"I AM FREE! Free to exact vengeance upon he who has imprisoned me!" Genie Jafar released from the lamp.
Abis Mal holding Genie Jafar's glowing Lamp.
"Let's not be to hasty my simple-minded friend! It's not enough that we simply destroy Aladdin. After all...there are things so much worse than DEATH!
The insanely-greedy Abis Mal holding Jafar's Lamp while Jafar summons loads of treasures in exchange of him setting him free.
The Lamp (either Genie's or Jafar's) made a cameo in the ride Star Tours: The Adventures Continue. Upon finding it in the luggage, G2-9T will state that the Star Tours' non-smoking policy extends to luggage as well.
Jafar's Lamp might be black to reflect Jafar's villainous personality.