Onyx — gemstone, meaning & jewelry at a glance

Onyx is a deep-black gemstone from the chalcedony family — valued for its rich, even color and silky luster after polishing. In the world of jewelry, onyx has represented elegance with character since antiquity, and its clear black color pairs especially beautifully with 925 silver and white gold. In this guide, you will learn what makes onyx special, what cultural significance is attributed to it, and how to care for onyx jewelry properly.

Onyx belongs to the large quartz family, more precisely to chalcedony — a fine-crystalline mineral. The best-known variety is black onyx, although strictly speaking, onyx refers to a banded variety with parallel layers. In jewelry, the term usually refers to the evenly black stone, which impresses with its dense, opaque color and intense luster after polishing. With a hardness of around 6.5 to 7 on the Mohs scale, onyx is comparatively durable and therefore well suited to everyday jewelry wear.

• Family: Chalcedony / quartz
• Color: classic deep black, also with white bands (sardonyx: brown and white)
• Hardness: approx. 6.5–7 (Mohs) — suitable for everyday wear
• Appearance: matte to highly polished, opaque

One point that often comes as a surprise: onyx sold commercially is very often color-treated. Natural black onyx is rare, so light-colored chalcedony has traditionally been dyed to achieve the rich, even black we associate with the stone. This treatment has been common since antiquity, is recognized as standard practice, and diminishes neither its beauty nor its durability. Alongside classic black, you may also encounter onyx in other varieties — such as brown-and-white-banded sardonyx or greenish-dyed versions.

The meaning of onyx has a rich cultural and historical tradition. The stone was already popular among the Greeks and Romans in antiquity — its name derives from the Greek word for “fingernail.” For centuries, onyx was regarded as a stone of steadfastness and inner calm; it was said to provide stability and concentration. In many cultures, its deep black color symbolizes elegance, dignity, and endurance.

Onyx also played an important role in the art of gem carving: the banded stone was used to create intricate cameos and signet rings, in which light and dark layers formed delicate reliefs. This long tradition still makes onyx a stone with character and history.

As a “black gemstone,” onyx is also often given for special occasions — as a sign of constancy and connection. Anyone looking for a stone with meaning that does not need to make a loud statement will find a calm, confident choice in its deep black color. This combination of clear color and profound impact explains why onyx has remained popular across so many eras.

Black onyx is an all-rounder. Its clear, neutral black can be combined with almost any outfit — from a business look to an evening gown. The contrast with light-colored precious metals is particularly elegant: 925 silver and white gold frame the deep black with radiant brilliance, while 585 yellow gold creates a warm, classic contrast.

In our silver jewelry collection, you will find bright settings that create a beautiful contrast with dark stones. If you would like to combine onyx with yellow gold, explore our gold jewelry. Our gold necklaces with gemstones and gold rings with gemstones showcase a selection of richly colored gemstone pieces — from deep blue to warm natural tones.

• Silver ring with onyx: a modern classic, suitable for women and men
• Onyx pendant: a dark accent that looks understated on a delicate chain
• Onyx earrings: add a clear, elegant accent at the ear

Another advantage: onyx is suitable for everyday wear. Thanks to its good hardness, the stone withstands daily use better than many softer gemstones — provided you treat it with the usual care. An onyx piece can quickly become a trusted companion, pairing just as well with a sweater as with an evening look. If you would like to combine several pieces, it is best to stick to one consistent precious metal so that the black remains the calm focal point.

Onyx is durable, but not indestructible. With a few simple rules, your onyx jewelry will retain its luster for a long time:

1. Clean onyx only with lukewarm water, a little mild dish soap, and a soft cloth.
2. Avoid ultrasonic cleaners, steam cleaners, and harsh household remedies such as aluminum foil and baking soda — they can damage the polished surface.
3. Keep the stone away from perfume, creams, and hairspray; put on onyx jewelry only after applying cosmetics.
4. Store it dry and separately so that harder stones do not leave scratches.

Since the 925 silver used in Splendido Jewelry pieces is rhodium-plated, the setting is additionally protected against tarnishing — gentle cleaning is enough to keep both the stone and the metal radiant. With a nickel-free 585 gold setting, care is even simpler, as gold neither tarnishes nor rusts. One final tip: briefly wipe your onyx with a dry cloth after wearing it. This removes skin oils and dust before they settle, allowing the stone to retain its silky luster for years.

At Splendido Jewelry, you will find handpicked, carefully selected pieces made from genuine 585 gold (nickel-free and non-tarnishing) and solid, rhodium-plated 925 silver crafted by Italian goldsmiths. Browse our gemstone necklaces or find inspiration in our rings with gemstones. With every order, you enjoy free shipping and returns as well as a 30-day right of return — delivery usually takes 3–5 business days to Austria, Germany, the Netherlands, and Belgium.

Onyx effects & meaning

Black onyx has traditionally been said to represent protection, inner strength, and grounding. In many cultures, it is regarded as a stone of boundaries and concentration. These effects have not been scientifically proven – as a gemstone, onyx primarily impresses with its deep, elegant black color.

Frequently Asked Questions