Nine antique gem-set rings

Nine antique gem-set rings, including an 18ct gold 19th century ring set with two half pearls, each shoulder set with a sapphire and two rose-cut diamonds, maker's mark CG, size J. A 12ct gold 19th century ring set with a line of rubies and a line of seed pearls with foliate engraved shoulders, maker's mark MJR and Birmingham mark for 1873, size O. A 19th century 12ct gold ring set with five red stones and seed pearls, maker's mark MJR, Birmingham mark for 1872, size Q. A 15ct gold ring set with three small coral cabochons and two seed pearls to each shoulder, Birmingham marks for 1900, size Q. A 19th century 18ct gold ring, set with a centre cluster of four green stones, seed pearls and four rubies with pierced scroll shoulders, Birmingham marks for 1866, size M. A late 19th century gold ring set with four opals and six small rubies, size M 1/2. A 19th century gold ring set with two oval-shaped chrysolites and two garnets, size O 1/2. A 19th century 15ct gold ring alternately-set with four emeralds and three garnets, with scroll engraved shoulders, size R.