Could also be worn by a woman. Marked 10k and is also marked'Copley'. I believe this is a blue sapphire, as the color is beautiful when the light shines on it.
From a very old Estate, however the actual age is unknown to me. The item "Old Estate Sapphire Gold Mens Ring Vintage Antique Beautiful Retro" is in sale since Tuesday, September 19, 2017. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Fine\Retro, Vintage 1930s-1980s\Rings". The seller is "plantress" and is located in Medina, Ohio. This item can be shipped to United States.