The last known pair of Rembrandt portraits in private hands sold for more than £11 million ($14 million) at Christie's in London on Thursday -- nearly 200 years after they first went under the hammer at the auction house. The last known pair of Rembrandt portraits in private hands sold for more than £11 million ($14 million) at Christie's in London on Thursday -- nearly 200 years after they first went under the hammer at the auction house.