Ring with 45 brilliant-cut diamonds,

Ring with 45 brilliant-cut diamonds, central brilliant 0.45 ct, chamfered, RW (F-G)/SI (engraved), 44 brilliant-cut diamonds totalling 0.27 ct, RW-WHITE (G-H)/SI (engraved), 18K white gold, 2,8 g, ring size: 51, W: ca. 1.7 - 2.6 mm, 21st century, minimal signs of wear, with hallmark 'HANS RIVOIR'.