PalmBeach Jewelry Men's Cushion-Cut Onyx and Cubic Zirconia Ring in 18k Gold over Sterling Silver FREE SHIPPING on orders of $30.00 or more - Top Rated Seller - Trusted Since 1952 - 90 Day Guarantee - Easy Returns - Free PalmBeach Jewelry Gift Box 18k Yellow Gold Over Sterling Silver - Quality Stamp (.925) Black Onyx is a variety of the gemstone chalcedony, dramatic in color and rich in history. Ring Style: Classic - Theme: Nuggets and Bling A fabulous men's two-tone ring is crowned with a faceted onyx, surrounded by the dynamic sparkle of cubic zirconia accents. A look with modern momentum designed especially for today's mover and shaker in 18k gold (40 mils) over sterling silver. Sizes 8-13.