H. Stern Amethyst and diamond cocktail ring featuring a large oval faceted amethyst measuring 24x16mm and weighing approximately 20 carats with royal brilliant purple color, flanked by eight round brilliant cut diamonds on each side, total weight of 0.90 carats, G color SI clarity.
 
Designer: H. Stern
Weight: 12.6 grams
Main Stone: Amethyst
Length: 24mm
Width: 16mm
Ring Size: 7.75 sizable
Diamond Weight: 0.90 CTTW
Metal Purity: 18K Yellow Gold
Hallmarks: S 750
Era: 1960's
Country of Origin: Brazil