PalmBeach Jewelry Marquise-Shaped Genuine Onyx Crystal Accent 14k Yellow Gold-Plated Swirl 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: Cocktail The dark beauty of onyx is brightened by sparkling crystal accents on this stunning ring. 14k Gold-Plated. Sizes 5-10.