4th - 5th AD Roman / Byzantine (Late Antique) gold diadem with amethyst and emeralds. Held at Walters (Acc 57.549). 12 1/4&quot; h x 1 1/8&quot; w x 3/8&quot; d (31.1 x 2.86 x 0.9 cm).  Found in Constantinople (Istanbul, Turkey).  Per Walters: &quot;The ten sections of this openwork diadem were each adorned with a central gem and pearls, now missing. The diadem was sewn onto a headband of leather or cloth with holes so wearers could adjust the size. Similar pieces were also worn as neckbands.&quot;