I believe this is circa 1930's-40's. The diamond measures very close to 6mm in diameter. The art deco design shows absolutely no signs of wear.I have not had this cleaned or appraised, but tested positive for a diamond. The item "Vintage Art Deco Men's 14K White Gold. 50 Carat Diamond Ring" is in sale since Monday, November 21, 2016. This item is in the category "Jewelry & Watches\Men's Jewelry\Rings".
The seller is "salisbur" and is located in Skowhegan, Maine. This item can be shipped worldwide.