Power Gem

What is it?
The Orb. The orb is shown below and is first shown in Guardians of the Galaxy

The Owner
The current owner of the orb is the Nova Corps. This was shown Guardians of the Galaxy when Star Lord said that the only people he could trust with the stone is the nova corps.

Info on The Orb
NOTE: THIS IS NOT ALL FROM THE MARVEL CINIMATIC UNIVERSE. The Orb is the protective housing of an Infinity Stone closely resembling a purple gem. The gem is an incredible power source, which, when used at full potential, has enough power to obliterate an entire planet. This stone was sought by Thanos, who tasked Ronan the Accuser to acquire it from the dead planet of Morag. Star-Lord acquired the stone instead and was prepared to give it to Taneleer Tivan until its destructive power was unleashed inside of Knowhere. Soon after, Ronan obtained it and harnessed its energy with the intent of destroying all life on Xandar and killing Thanos. Quill and the Guardians of the Galaxy were able to take the stone from Ronan and collectively harness its power to destroy him. They then gave the stone to Nova Prime for safe-keeping.