VICTOR MAYER medallion with 20 sapphires, 5 octagonal diamonds and 6 brilliant-cut diamonds

VICTOR MAYER medallion with 20 sapphires, 5 singel-cut diamonds and 6 brilliant-cut diamonds totalling ca. 0,11 ct, good colour and clarity, 19 round-cut sapphires D: ca. 1 mm, 1 sapphire ca. 0,28 ct, pear-cut ca. 4.8 x 2.9 mm, yellow gold 18K, 15,9 g, D: ca. 30,2 mm, eyelet D: ca. 3,6 mm, late 20th century, minimal signs of wear, with hallmark.