A hair ornament is anything decorative that one would wear on one's head. This would include crowns, tiaras, barrettes, aigrettes, combs, bandeaus and others. Some of these serve an additional purpose - holding the hairstyle in place.
Georgian hair ornaments had several motifs, naturalistic, Greek key, and themes from antiquity. Diamonds, Pearls or cut steel sat atop the sky scraper hairstyles and wigs so popular at the time. The aigrette was also often found hiding among the curls in many colors and often en tremblant.