Classic Otto Collection is made by 925 sterling silver with Turquoise (Feroza), Agate (Aqeeq) and Onyx gemstones. Oval Stone shape 925 sterling silver men rings by Boutique Ottoman Classic Otto Collection. At sides used special ornament with yellow color rhodium plated 925 sterling silver frame. All made in Istanbul, Turkey by Boutique Ottoman Jewelers. Suitable for daily use with your favorite gemstone.