Cathleen McLain Brutalist high quality Handcrafted Sterling Geode Brooch

Artisan crafted, brutalist sterling and Geode brooch
Brown tones geode, measures 1-3/4" diameter
The sterling has a gold wash and is 2-1/2" wide across the top
There is high quality a small moonstone set in the sterling as well.
The piece is marked sterling, but no makers mark.
Has been identified as a piece my CT artist Cathleen McLain