This brooch is a lovely vintage c. 1950s Napier mesh flower … or perhaps a sea anemone. It reminds me of the Belle of Barmera giant dinner plate dahlia–a large bigger-than-life flower. The piece measures 5″ when spread flat.

This lovely Napier moonglow brooch matches the necklace and earring set on page 272 of The Napier Co.: Defining 20th Century American Costume Jewelry. The necklace was featured in “The Charleston Daily” November 16, 1955. It was also available in silver-plate with blue moonglow cabochons.