IT IS NOT A FAKE DIAMOND. Engalhart Cornelius Ostby is a legend in the jewelry trade. He emigrated fromOslo, Norway to the US in 1869.After forming his own company with his partner, Nathan Barton in 1879, they became well known for their high quality and beautifully made jewelry. Ostby later perished when the Titanic sunk in 1912. Here is your chance to own a beautiful collector's piece by Ostby & Barton! Please be sure to view all photos! Browse our other listings to find great deals on estate and antique vintage items. Antique item w signs of age related wear. The item "ANTIQUE OSTBY BARTON'OSBEE' 10K YELLOW GOLD DOUBLE BLUE ZIRCON RING SZ 7 OB" is in sale since Friday, September 11, 2020. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Fine\Art Nouveau/Art Deco 1895-1935\Rings". The seller is "foxyvalentino" and is located in Salt Lake City, Utah. This item can be shipped to United States.