A PAIR OF FULL-LENGTH PORTRAITS by Rembrandt van Rijn hung side by side in Amsterdam’s Rijksmuseum. Painted in 1634 on the occasion of the wedding of Marten Soolmans and Oopjen Coppit, they depict the well-heeled newlyweds in their late twenties, attired in velvety black garments ornamented with lace collars and rosettes—the kind of austere finery typical of the ascendant mercantile class of the so-called Dutch Golden Age. The twin canvases were jointly acquired by the French and Dutch governments in 2016, becoming, behind Leonardo’s Salvator Mundi, ca. 1500, the second-most valuable old-master