This item sold on October 7, 2012.
4 inches in diameter (including silver rim)
3 inches in diameter (not including silver rim)
Other important info:
Great vintage condition (no chips or cracks)
Each silver rim marked with "Keonana" and "Silverplate Italy" (see photo)
Starburst pattern in glass bottom
Fits glasses/cups with bottom less than 3 inches in diameter (most glasses)
Thank you for looking!