Onyx: color, authenticity and jewelry care

Onyx is often chosen for its simple, timeless expression. The black colour creates a clean, refined look that can make a piece feel more striking without turning into “bling”. At the same time, the term onyx is used in different ways, which can be confusing. Below you’ll find a clear overview of what onyx is, which varieties exist, and how to care for jewellery set with onyx.

What is onyx?

Onyx is a variety of chalcedony (part of the quartz family). Classic onyx is defined by layers/bands, but in jewellery the term “onyx” is very often used to describe black onyx – an opaque, deep black stone that is polished smooth.

So you may come across onyx in two “meanings”:

• Onyx as banded chalcedony (more geologically correct)

• Onyx as a black, polished stone (most common in jewellery)

What colour is onyx – and which types are there?

• Black onyx: The best-known. Often deep black or nearly black. May have white layers, and in some cases the black colour is enhanced artificially.

• Arabic onyx: The traditional variety with black and white bands.

• Nicolo onyx: Black onyx with a thin white layer on top.

• Sardonyx: White layers with brown/reddish layers. Also known as a classic birthstone for August.

• Green onyx: Occurs naturally, but is often colour-enhanced for a stronger, more even shade.

• Pink onyx: A rarer variety with soft pink tones and banding.

• Blue onyx: Seen in deep blue shades, sometimes with greener undertones.

• Pink/white onyx: Varieties with light pink-white tones and layers.

Colour enhancement: Some types of onyx (especially black and green) may be treated to intensify the colour and create a more uniform look.

Is onyx a real stone?

Onyx can be natural, but black onyx used in many jewellery pieces may also be treated/dyed to achieve a more even, deep black tone. This is not unusual in the industry because it creates a stable, consistent appearance.

For you as a customer, it mainly means onyx typically looks very uniform and “clean” – which is part of the appeal.

Is onyx transparent?

No. Onyx used in jewellery is typically opaque. Its character comes from the depth of colour and the smooth surface.

What does onyx look like in jewellery?

Onyx is often used when you want:

• a minimalist look with strong contrast

• a stone detail without sparkle

• a piece that feels classic and easy to style

The finish is often high-gloss (most common), but can also be more matte depending on the design. Overall, onyx delivers a clean, elegant look.

Which metals work well with onyx?

Onyx is one of those stones that works with almost anything:

• Silver creates a cool, graphic, modern feel

• Gold/gold-plated adds warmth and a more classic, luxurious look

Black onyx also pairs easily with other stones and pearls because it acts as a neutral base.

How durable is onyx?

Onyx is relatively robust for everyday wear, but it can pick up scratches or small marks from hard knocks – especially in rings that often hit edges or experience friction. Earrings and necklaces usually see less wear and often stay pristine longer.

Can onyx handle water, soap and perfume?

Onyx handles normal wear well, but like most jewellery it’s best to avoid unnecessary contact with:

• cleaning products and strong soaps

• chlorine (swimming pools)

• perfume and hairspray directly on the jewellery

This helps protect both the stone’s surface and the metal setting so your piece stays beautiful longer.

How do you clean onyx?

Clean onyx gently:

• use a soft cloth (dry or slightly damp)

• if needed: mild soap in lukewarm water

• always dry afterwards with a soft cloth

Avoid abrasive products and hard brushes, especially if the onyx is polished to a high shine.

How should you store onyx jewellery?

Store onyx separately from other jewellery so the smooth surface doesn’t get scratched. A small pouch or a separate compartment in your jewellery box is ideal.

Why do so many people choose onyx?

Onyx is popular because it:

• looks exclusive while staying simple

• works with all colours and outfits

• can be both everyday-elegant and party-ready

• makes a clear statement without glitter

If you want a stone that feels calm, stylish and easy to wear again and again, onyx is a safe choice.