PalmBeach Jewelry Men's Emerald-Cut Genuine Onyx Crystal Accent 14k Yellow Gold-Plated Ring Top Rated Seller - Trusted Since 1952 - 90 Day Guarantee - Easy Returns - Free PalmBeach Jewelry Gift Box Black Onyx is a variety of the gemstone chalcedony, dramatic in color and rich in history. Ring Style: Classic Raise his fashion bottom line with this men's onyx ring. With crystal accents. Set in 14k Gold-Plated. Sizes 8-13.