I think it's probably 'variegata', but it was sold simply as 'Rhoeo' - no other description. It's the first time I've grown this plant. For a member of the Tradescantia family it is growing really, really slowly. It's growing and looks nice and healthy, but the rate of growth is really different from other Tradescantias in my growing experience. I thought it might turn a darker purple once it was potted and in place, but the color has been stable and it's been out about 6-7 weeks now and all the new growth is staying the same as the older growth.
