Onyx/ˈɑːnɪks/ Definition 1 of 2Pro Tip 1/3Polishable Stone Onyx can be polished to be very shiny, often found in elegant jewelry and ornaments. His cufflinks were made of polished onyx. Pro Tip 2/3Luxury Connotation Onyx in jewelry suggests luxury and can be expensive, symbolizing sophistication. The onyx ring she wore signified her refined taste. Pro Tip 3/3Variety of Colors Despite often being black, onyx stones can come in multiple colors, each with unique patterns. The bracelet had beads of green, red, and black onyx.