Small onyx gemstone cross pendant. Onyx is a translucent vitreous black coloured gemstone, believed to protect the wearer from worry. Like many onyx beads on the market, our beads have had a permanent black dye applied, rendering the beads a solid black colour. Size: approximately 18mm x 34mm (including base metal bail) x 5mm thick. Please note that colours and sizes will vary from piece to piece. The finding is not sterling silver.