Does doctor strange have the time infinity gem? [on hold]

I know that Ronan's stone in Guardians of the Galaxy is the power stone, the stone in Loki's staff is possibly the mind stone, the tesseract is possibly the space gem, the Aether is probably the soul gem seeing as it was killing Jane.

Doctor strange has a suspicious stone that can reverse time in some situations... Could this be the location of the Time gem?