Art Deco 0.80 Carat Old European Cut Diamond Engagement Ring

Finely crafted in platinum with an Old European cut center diamond, weighing 0.80 carats.
G color, SI1 clarity
The ring features round diamonds on the setting, weighing approximately a total of 0.30 carats.
Art Deco, circa 1920s
Size 9 3/4, resizable