aigrette
noun
ai·grette ā-ˈgret 
ˈā-ˌgret
1
: a spray of feathers (as of the egret) for the head
2
: a spray of gems worn on a hat or in the hair
Example Sentences
Recent Examples on the Web Delicate and adorned with wispy white feathers that wouldn’t come cheap, this aigrette (the French word for egret) would rest atop the head of a rich and fashionable society figure. 
Angela Serratore, Smithsonian, 15 May 2018
Angela Serratore, Smithsonian, 15 May 2018 Word History
Etymology
French, plume, egret, from Middle French — more at egret
First Known Use
1631, in the meaning defined at sense 1