Pendant medallion with emerald cabochon set with 12 brilliant-cut diamonds

Pendant medallion with emerald cabochon surrounded by 12 brilliant-cut diamonds totalling ca. 0.18 ct, good colour and clarity, oval-cut emerald, ca. 4.6 x 3.8 mm, beautiful colour, with natural signs of growth, 18K yellow gold, 15.8 g, medallion: framed by floral engraving, L: ca. 52.2 mm, W: ca. 30.5 mm, eyelet D: ca. 3.7 mm, 2nd half of 20th century, minimal signs of wear.