Gemstone Guide
Birthstone of August
Crisp and clean, black onyx is the ideal gem for jewelry minimalists. The solid black stone compliments all metals and colors.
Black Onyx
Crisp and clean, black onyx is the ideal gem for jewelry minimalists. The solid black stone compliments all metals and colors.Read More
| Color | Sophisticated Black |
| Gem Species | Chalcedony |
| Hardness | 7 |
| Toughness | Excellent |
| Stability | Good |
| Clarity | Opaque |
| Common Inclusions | Generally not visible due to opaqueness |
| Crystal System | Trigonal, Monoclinic |
| Enhancements | Dye |
| Gemstone Care | Avoid Steam Cleaning,Ultrasonic Cleaner with Caution,Soap, water, and soft brush |
| Chemicals to Avoid | Hyrdofluoric Acid, Ammonium Fluoride, and Alkaline Solutions |
| Note | *Do not use harsh chemicals or ultrasonic cleaners at home* |
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