This brooch is in perfect condition and has been acid-tested to show 18K gold.
There is a stamp inside, though it is illegible.
The enamel is perfect- no chips/scrathes of any kind.
The wingspan is just over 3/4" (20mm) across, and just over 1/2" (14mm) tall, and the weight is 2.8 grams.
18K & Enamel Butterfly Brooch.