Item Description: OB Hallmark with Cross… Ostby & Barton with a 5ct Natural Old Cut Blue Zircon. NICE looking piece and solid 10k yellow gold. RARE Find and so nice. Ostby lost his life on the Titanic and since these are rare and collectible. I love this piece. Well made and so nice. GORGEOUS and well preserved. Circa 1890s and 130 years old. Stone: Natural Blue Zircon. Metal: 10KT YELLOW GOLD. Ring Size: 9.25. Gram Weight:3.3 GRAMS. Powered by SixBit’s eCommerce Solution. The item “Antique $4K Victorian Ostby & Barton Natural 5ct Blue Zircon 10k Gold Mens Ring” is in sale since Wednesday, June 3, 2020. This item is in the category “Jewelry & Watches\Fine Jewelry\Fine Rings\Gemstone”. The seller is “oldtreasures333″ and is located in American Fork, Utah. This item can be shipped worldwide.