ai·grette or ai·gret 
(ā-grĕt, āgrĕt′)
(ā-grĕt, āgrĕt′)n.
1. An ornamental tuft of upright plumes, especially the tail feathers of an egret.
2. An ornament, such as a spray of gems, resembling a tuft of plumes.
[French, egret, from Old French; see EGRET.]