JACOBI ring with very fine Siam ruby ca. 2.48 ct, oval-cushion and trapeze-cut diamonds totalling ca. 1.39 ct, ca. FW (G)/VVS, 18K yellow gold, 7.6 g, ring size 59, 1980s, good condition, marked 'Jacobi', ruby with high clarity and vivid colour, including Jacobi certificate.