PalmBeach Jewelry Genuine Onyx Barrel and Beaded Necklace in Yellow Gold Tone 100" FREE SHIPPING on orders of $30.00 or more - Top Rated Seller - Trusted since 1952 - 90 Day Guarantee - Easy Returns Black Onyx is a variety of the gemstone chalcedony, dramatic in color and rich in history. Necklace Style: Endless Take it to new lengths with this shiny onyx barrel and golden beaded necklace. Wear it any way you like, long and lovely, or wound round 'n round thanks to its lavish 100" length. The neutral shade black will pair up beautifully with all of your outfits! Yellow gold tone.