Renaissance revival was a style of design emerging in the mid to later part of the 19th century.
It lifted Renaissance motifs and their forms and reinterpreted them. The art of enameling was one of the prime forces during the Renaissance and this ring successfully uses this adornment in a refined way.
The center is a natural, table-cut emerald (5 x 4.7 mm). Its earthy green tones are balanced by the gold box bezel. It rises above and with arches of white enamel (a favored pattern and color during the Renaissance).
On each side, two rose-cut diamonds are also bezel set with royal blue enamel arches beneath. Scrolling ends rest to the north and south of the emerald. These are adorned with a burnt orange enamel; then taper down, melding to one smooth shank. More enamel of green and white decorates those surfaces.
Underneath, a fleur de lis shows off more white enamel, with cobalt blue enamel swirls to each side. Rings from the 15th and 16th centuries also would have been enameled on the reverse.
The stones are set closed backed and the setting is 14k yellow gold. From the Austro-Hungarian region, if not for the hallmarks, one could easily speculate if this were a great deal older than its 133 years or so.