Definition
A banded variety of chalcedony quartz often dyed black for bold jewelry.
Key Features
- Hardness about 6.5 to 7 with good durability
- Commonly cut as cabochons or cameos
- Natural banding may be subtle; dyeing is widespread
- Classic black onyx offers strong contrast in designs
Origin and History
Used since antiquity for intaglios and cameos. Modern supplies come from multiple regions worldwide.
Buying Guide
Decide on natural versus dyed material. Ensure solid craftsmanship to resist chipping on edges.
- Ask sellers to disclose dye treatments
- Inspect polish and edge integrity on geometric cuts
- Consider protective bezels for rings
Care and Maintenance
Clean with mild soap and water. Avoid harsh chemicals that can affect dyes.
Related Comparisons
FAQs
Is black onyx natural
Natural black exists but many commercial stones are dyed for consistent color.
Does dye fade
Quality dye is stable under normal wear but avoid strong chemicals.
Is onyx good for men's jewelry
Yes its bold contrast suits rings, cufflinks, and pendants.