Onyx Jewellery Onyx is a black variety of chalcedony, a cryptocrystalline variety of quartz. Showing all 3 results Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Blue Onyx and Sky Blue Topaz Earrings $135.00 Add to cart White Onyx Bangle $80.00 Add to cart Black onyx and sterling drop earrings $55.00 Add to cart