An antique 18ct yellow gold & platinum ring set with a central old oval cut diamond, approx. 1.22

An antique 18ct yellow gold & platinum ring set with a central old oval cut diamond, approx. 1.22 carats, the colour of the diamond is showing hues of natural light brown and is approx. SI2-I1 clarity, there are three small old rough cut diamonds set to each side, total weight approx. 0.03 carats, 2.32gm, size L.