Brooch with sapphire and beautiful diamond roses

Brooch with sapphire ca. 1.6 ct, and beautiful rose-cut diamonds totalling ca. 1 ct, 14K yellow and white gold and platinum, 6 g, L: 5.5 cm, 1st half of 20th century, sapphire perhaps secondary, is slightly crooked, in former times perhaps with safety chain, backwards still with eyelet, 1 diamond is cracked, some slightly chipped, minor signs of wear and some signs of work.