These 12mm faceted black agate gemstone beads are beautifully cut with consistent color and excellent polish. Nelson specializes in high quality gemstone beads wholesale to the public.
An agate by definition is a banded chalcedony. Onyx is a black chalcedony with white banding. Most so-called black onyx and black agate beads are gray agates that have been dyed in a solution of sugar and then sulphuric acid.
- Bead Size: 11.75mm to 12.05mm
- Strand Length: 15.25" Minimum
- Facets: 128
- Treatments: Waxed. Dyed.