This little antique / vintage butterfly was taken from plans for jewelry.
The color and the end piece remind me a tear.
This would make a great piece to create stickers or ephemera with.
Source:
RIJKS Museum
Museumstraat 1, 1071 XX Amsterdam, Netherlands
©: listed as Public Domain with CC1.0 license
More information about CC1.0 can be found here:
https://creativecommons.org/publicdomain/zero/1.0/deed.en