23 1/2 diameter, and approx. Please keep in mind that I know absolutely nothing about this items history. Please examines the photos carefully to see what is included and what is not included. I will describe it's condition as best as I can by telling you what I see.We are human and may sometimes make mistakes pertaining to condition, age, origin, authenticity, etc. These are just honest mistakes or oversights, not to attempts to defraud. If you make a mistake, I will afford you this same common courtesy. The item "23 1/2 VINTAGE TIFFANY STYLE STAINED GLASS LAMP SHADE" is in sale since Sunday, August 5, 2018. This item is in the category "Collectibles\Lamps, Lighting\Shades". The seller is "mm120355" and is located in Huntington Beach, California. This item can be shipped worldwide.