Onyx and Jasper cufflinks sounds like a comedy team, doesn't it? Actually, Onyx and Jasper are two of the most beautiful and breathtaking elements used in high-end and high-quality accessories and jewelry. Onyx is actually a form of quartz, and comes in a variety of colors. Onyx and Jasper ... sounds like a comedy team, doesn't it? Actually, Onyx and Jasper are two of the most beautiful and breathtaking elements used in high-end and high-quality accessories and jewelry. Onyx is actually a form of quartz, and comes in a variety of colors.