This is an antique piece that I acquired in Europe, it is hallmarked "18 CT & PLAT". Sapphires and diamonds tested accurately on my Presidium gem tester.The sapphire is about 7mm by 5mm and the diamonds are about 3mm in diameter. Please note that all my pieces are in estate condition. When I look at it lit up under magnification, I can see two flea bites and a few nicks to the stone, some scuffs to the facets. Some surface wear to the gold and stones not seen with the naked eye, but I tried to show it really zoomed in in the photos. The sapphire looks a deep navy to royal blue to the eye, and then when lit up under magnification, appears a little more greenish. Still nicely shaped, a very sweet piece. But as with all my estate pieces - please note this is not a mint condition item. I always recommend gentle wear for these old pieces. Thanks so much for looking at my store! The item "SAPPHIRE 2 Old Cut Diamond EDWARDIAN 18k GOLD Ring PLATINUM 3 Stone ANTIQUE 1910" is in sale since Monday, April 5, 2021. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Fine\Art Nouveau/Art Deco 1895-1935\Rings". The seller is "callmemouse" and is located in Minneapolis, Minnesota. This item can be shipped to United States.