Ring with central brilliant-cut diamond approx..10 ct (best) and 55 brilliant-cut diamonds

Ring with central brilliant-cut diamond ca. 0.10 ct (chipped) and 55 brilliant-cut diamonds totalling ca. 0.85 ct, WHITE/P, pavé set, white/yellow gold 18K, 4.1g, ring size: 57, 1st H. 20th century, minor signs of wear, handcrafted work, probably France, with certificate.