Hallmarks for 18K gold, London, 1980. Tested for 18k gold with acid, the yellow and the white part. peridots of 0.08 ct each, of a wonderful color, AAA quality. In the middle a natural, round brilliant diamond in a white gold "illusion" setting that makes it seem like the diamond is much larger, about 0.52 ct (I measured the illusion set part between the peridots and it is 5.7 mm in diameter). It is a ring that looks better in reality than in the pictures. The crown has 1,1 cm in diameter. Can be used as a cocktail ring or engagement ring. Can be resized for free up to size 56 1/2.