Vintage spacer beads, custom-cut black onyxes. Note the gray color in the bead holes and some surface areas. Like most black onyxes, these stones were dyed. Photo © Joel E. Arem, PhD, FGA. Used with permission.
Opaque Black Chalcedony Bead, Dyed
Vintage spacer beads, custom-cut black onyxes. Note the gray color in the bead holes and some surface areas. Like most black onyxes, these stones were dyed. Photo © Joel E. Arem, PhD, FGA. Used with permission.
Article: Onyx Properties, Varieties, and Jewelry Information
Credit: Joel E. Arem, PhD, FGA
| Gemstone | Quartz, Chalcedony, Onyx |
| Treatments | Dyeing |
| Natural or man made | Natural |
| Gem State | Bead |
| Color | Black |
| Transparency | Opaque |