I respond to IDs in the chance that someone comes along and compares their plant to the one posted. I agree that it is a Tradescantia, but believe it is a form of fluminensis . The red stem is the reason I said chose the reverted Laekenensis Rainbow. This plant gets confused with it's very close relative T fluminensis, which has a green stem. The reverted rainbow has red stems and with increased light exposure the bottom of the leaves can turns purple. There is a plant called Green Hill, it's scientific name is the Tradescantia Fluminensis 'Laekenensis Rainbow' reverted.