1960-1969 Amethyst Cocktail Rings. From our unique collection of Modernist Rings, this piece is offered for sale online by Abbott & Austin Inc. Global shipping is available. An impressive and elegant ring set in 14 karat white gold with a large, brilliant, ice-skating rink of an amethyst - approximately 50 carats - accented on all four sides by petite diamonds. It's made for a size 7 1/2 finger but can easily be sized up or down. This stunner measures almost an inch and a half up and down the finger and is a perfect addition to anyone's ring collection.