Black onyx always makes green malachite pop! I love this gemstone combination. The necklace has 8.5mm malachite and black onyx rounds. There are 21mm bi-conal black onyx accent beads. The gold beads are 14k gold fill as is the clasp. The necklace is 24.5" long. The clasp is fish hook style. The necklace has beautiful colors and wonderful shapes.