Vintage Large AB Pinwheel Brooch Gold Tone

Vintage Large AB Spiral Brooch Gold Tone Juliana Style. The brooch is unsigned so possibly Juliana as I found similar Juliana brooches like this one. The brooch is 2 1/4 in. and is an inverted dome (not sure how to describe it). It is approx. 1/2 in. deep, See second photo. There faceted AB stones are prong set, gold tone metal, no missing stones and sparkle blue, purple, green and orange or amber. Weighs 34 grams