Vintage 9 Carat Gold & Diamond Ring by DS & Co, London, 1981. Size N 1/2.A stunning vintage 9 carat gold and diamond ring, fully hallmarked '375' (9 carat gold), DS & Co, London, 1981. The ring has a central 0. 10 carat diamond in a cathedral setting, flanked by two 0. 005 carat diamonds either side. The ring shows some light scratches to the gold commensurate with age and one of the prongs is shorter than the other five (please see photographs). Dimensions Ring Size: N 1 2 Weight: 2 grams