Crystals.com
Onyx
Authentic natural minerals, thoughtfully sourced and individually photographed.
Onyx is a banded variety of chalcedony, a microcrystalline form of quartz with the chemical formula SiO₂. It belongs to the trigonal crystal system and has a Mohs hardness of 6.5–7, making it one of the more durable decorative stones. True onyx features parallel bands of alternating color — most commonly black and white — though the term is widely used in the gem trade to refer to solid black chalcedony that has been uniformly dyed or heat-treated. Significant sources include Brazil, India, Uruguay, and Madagascar.
Onyx has been carved and polished since antiquity. The Romans used it extensively for intaglio seals and cameos, taking advantage of its distinct banding to create relief carvings with contrasting layers. In the Islamic tradition, onyx was set into rings and prayer beads. The name itself derives from the Greek word for "claw" or "fingernail," referencing the stone's translucent, banded appearance. Collectors today appreciate onyx for its deep, saturated black color and its excellent ability to take a high polish — it is a staple material for carved bowls, bookends, and display pieces.
Our onyx collection offers a range of options:
- Polished spheres, bowls, and freeforms
- Bracelets and jewelry
- Tumbled and palm stones
- Carved decorative pieces
Explore the full collection below.
Authenticity First
Know your crystal
Onyx
Onyx is chalcedony — quartz in crystals too small to see even under a microscope. Its uniform black is rarely how it leaves the ground: since Roman times, cutters have deepened pale banded stone with a sugar-and-heat treatment, a technique so old that Pliny the Elder described it nearly 2,000 years ago.
Let customers speak for us
LOVE IT. Colors are absolutely beautiful, the fit is perfect, and I'm so glad to say that I'm happy with the size of the crystals - I was afraid I wouldn't like to smaller size as I'm used to 8 mm.
This necklace is beautiful. They were out of it, but I love the substitution. All their jewelry is beautiful.
Love it so much! Looks and feels wonderful.
It's incredibly beautiful. Love that different aspects of it are highlighted in different lighting - in a bright setting you see a million tiny quartz on top that you would never know were there in the lower lighting setting. My favorite is the amazing combination of sections that sparkle and sections that are smooth and gleaming. Looks and feels wonderful. Perfectly packed too.
Love the scent, it's wonderful, and thank goodness for it as it gets rid of the odors that come in from outside, and is healthy because of the materials. Looks nice too.
Smells dreamy, is super relaxing, and is healthy because of the materials. Looks nice too.
Perfect and lovely way to appreciate these beautiful crystals - nature's jewels - and also have a place to store rings or bracelets.
A Sanctuary of Natural Beauty
Every crystal here was discovered by hand, selected with intuition, and photographed in its true light.
One-of-a-Kind. Forever Pieces.
Let the Universe Decide
