Vintage Sterling Silver 1960s Cocktail ring set with a huge 15ct Green Amethyst

Vintage 1960’s, Cocktail Ring in Sterlin Silver with huge 15ct finely faceted light Green Amethyst, with 3 Diopside gems to each side, plus high-light Diamonds to edges and shoulders. The metal design work to sides have detailed Butterflies, while the shoulders are supported on a “V” with “8” intertwined.Dimensions approx.:  Ring size “P”  or  “7 ¾”; Main stone Green Amethyst 15ct; band width 2mm at rear, to 10mm across shoulder pattern; band thickness 1mm at rear to 4mm at filigree, divided shoulders. Europe.