Ring, made with sterling silver 925 , sterling silver covered in 24K gold or 18K rose gold. Sizes of the ring : * Diameter(int): 16,4mm Size: PL:11/12 USA:6,0 UK:L * Diameter(int): 16,7 mm Size: PL:13 USA:6,5 UK:M * Diameter( int): 17,3 mm Size: PL: 15 USA:7,0 UK: O * Diameter( int): 18,3 mm Size: PL:18 USA: 8,5 UK: Q * Diameter ( int): 19 mm Size: PL: 20 USA:9,0 UK:S Thickness of the ring : ~2,10 mm