PalmBeach Jewelry Men's Genuine Onyx Diamond Accent 18k Gold over Sterling Silver Rectangular Ring 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 14k 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 Inspired by contemporary fashions, this smart and streamlined men's rectangular-shaped onyx ring is accented with round diamond accents in the front and to the side of the band. Exceptional styling in two-tone finish. 18k gold over sterling silver. Sizes 8-13.