Vintage Great Falls Metal Works Opal & Onyx Sterling Silver Brooch Modernist Pin

Vintage Great Falls Metal Works opal and onyx sterling silver brooch. Acquired from a private estate collection, this large modernist pin feature a mosaic style inlay of opal inlaid between black onyx. *Please note, the onyx is chipped in the top left corner, but it is hard to notice when worn. The opal is multicolor with vibrant blue and green tones. The mount is a long semi-circle shape. Signed GFMW hallmark on back. 2.6” length and 1.25” width.