Vintage 14K or 12K gold filled Modernist brooch w green jadeite jade stone

Vintage handmade Modernist Mid-Century Modern (MCM) brooch pin. With good quality deep green real jadeite jade stone. Airy and with a flow. Signed AMSEL GF. GF means that it is filled with real 14 karat (or, more rarely, 12 karat) gold and is much more resistant to wearing than gold plated jewelry. 5.3 cm long. Slight wear on the left edge, as pictured. Otherwise in very good condition.