Is Onyx Expensive—Properties, Meaning, and Jewelry

Is Onyx Expensive — Properties, Meaning, and Jewelry

*Last updated: 12 March 2026*

Table of contents

• What is onyx and what determines whether onyx is expensive?
• Properties vs. price: what affects a stone’s value?
• Is onyx expensive in custom jewelry?
• How to assess authenticity? Onyx against other minerals
• FAQ

What is onyx and what determines whether onyx is expensive?

Imagine the thick, impenetrable darkness of an ancient chamber, where the only source of light is the flickering flames of candles. It was in just such conditions that ancient rulers and magicians gazed into the smooth, tar-black surface of the stone, seeking answers to questions about the future. This stone is, of course, the star of today's story. Before we dive into the details, however, we invite you to read our comprehensive introductory guide, in which we describe the fascinating world hidden within natural onyx.

For many people taking their first steps into the world of mindful mineral collecting, one of the first questions is whether onyx is expensive. To answer it, we first need to understand what we are actually dealing with. From a geological point of view, onyx is a variety of chalcedony, that is, cryptocrystalline quartz. Its structure consists of microscopic crystals that are packed so densely that they form a solid, captivating mass. According to official data available in the Mindat mineral database, the Mohs hardness of onyx ranges from 6.5 to 7, which makes it an exceptionally durable stone and ideal for jewelry processing.

The value of this stone has been shaped over millennia. In ancient Rome and Greece, intricate cameos were carved from it, with prices reaching staggering sums. Today, however, thanks to the discovery of new deposits in various corners of the world, this stone has become much more accessible. To answer the question about cost directly — the raw material in its basic form is not among the most expensive gemstones in the world. That does not mean, however, that it is devoid of value. On the contrary, it is precisely its accessibility, combined with its remarkable elegance, that makes it a mineral so highly valued by artists and artisans.

The final price we encounter in jewelry stores is made up of many factors. The stone itself is only the beginning. Its size, cut quality, color intensity (or the distinctness of the natural bands in multicolored varieties), and setting determine how much we pay for the finished piece. It is the work of human hands, the designer’s vision, and the precious metals used that give it its final, high market value.

Properties vs. price: what affects a stone’s value?

Every stone taken from deep within the Earth carries within it the history of its evolution. In the case of onyx, that history is written in its deep black color, and sometimes in subtle, parallel bands of white, gray, or brown. These natural patterns are the mineral’s unique fingerprint — proof of its authenticity and individuality. No two specimens are identical, which for a conscious collector is of the highest value.

When wondering whether onyx is expensive, we must take into account its physical and aesthetic properties. The most highly valued specimens are those with a perfectly uniform, deep black color, free of cracks and characterized by a flawless, almost mirror-like shine after polishing. The cut plays a key role here. A masterfully executed faceted cut (although onyx is most often cut as smooth cabochons) can bring out an extraordinary play of light on the stone’s surface. The more precise the lapidary’s work, the higher the value of the final product.

We also cannot forget the metaphysical dimension, which for many people is as important as physical properties. In lithotherapy, onyx is considered a stone of inner strength, determination, and protection. It is believed that its dense energy can absorb and transform negative vibrations, becoming a kind of shield for the wearer. Although these are not medical promises, this esoteric aspect makes this stone sought after as a talisman, which naturally affects demand and its position on the market.

PRO TIP from Brazi: When choosing a stone for yourself, don’t look for perfect, synthetic smoothness. Tiny inclusions, subtle shifts in shade, or microscopic differences in structure are not flaws. They are proof that you are holding a true piece of nature, formed millions of years ago.

It is also worth mentioning durability. Thanks to its proper hardness, this stone stands the test of time excellently. It does not scratch as easily as softer minerals (e.g., malachite or lapis lazuli), which means that jewelry made with it can be passed down from generation to generation. This longevity is another argument for the fact that buying this mineral is an investment that retains its emotional and aesthetic value for years.

Is onyx expensive in custom jewelry?

Let’s move on to the most important aspect for lovers of beautiful accessories – its use in jewelry making. From our many years of experience at Brazi Druse Jewelry, we know that it is precisely the way a stone is set and displayed that determines its final prestige. A raw mineral undergoes a magical transformation in the hands of an artist, becoming a carrier of emotion and style.

Answering the nagging question, is onyx expensive in the context of finished jewelry, we have to look at the entire creative process. When we combine the deep black of the stone with the brilliance of sterling silver or the warmth of gold, a contrast of remarkable expressive power is created. In our signature workshop, Brazi Druse Jewelry in Warsaw, at ul. Grzybowskiej 61/5 in the Platinum Towers building (00-845 Warszawa), we make sure every day that each stone receives a setting worthy of its unique character. We invite you to visit us and see for yourself how craftsmanship and the quality of the precious metal affect the value of the finished piece.

Signature jewelry differs from mass production in that each design is carefully thought out and the stones are hand-selected. The cost of such a necklace or ring reflects the artisan’s hours of work, the unique design, and the amount of precious metal used. In this comparison, onyx appears to be an exceptionally rewarding stone – it allows creators to realize bold, large forms (the so-called statement jewelry) without driving the price up to a level reserved for multi-carat diamonds or emeralds.

It was especially popular in the Art Deco era, when its geometric cuts and sharp contrasts with diamonds defined the luxury of the 1920s. Today, we are witnessing a revival of this style. Contemporary jewelry draws on those patterns, offering elegance that works equally well in evening and everyday outfits. By choosing such a piece, you are investing not only in the mineral itself, but in applied art that never goes out of style.

How to assess authenticity? Onyx against other minerals

To fully understand this mineral’s position on the market, it is worth comparing it with other popular stones. We often hear questions, is onyx expensive compared with sapphires, rubies, or even black diamonds. The answer is: no, it is a much more affordable stone, which is one of its biggest advantages. It belongs to the group of semi-precious stones (although today this nomenclature is being replaced by the term "ornamental stones"), which means we can enjoy large, eye-catching forms without having to spend a fortune.

However, this affordability does not mean a lack of exclusivity. In modern times, luxury is increasingly defined less by the price of the raw material and more by the uniqueness of the form and the quality of workmanship. Black chalcedony gives us the chance to own an authentic piece of nature, with deep symbolism and an elegant appearance, without compromising on quality.

Unfortunately, popularity also brings some risk. In the jewelry market, you can often come across dyed agate sold as natural black onyx. Although both stones belong to the chalcedony family, the process of artificial dyeing lowers their collectible value. A true, untreated mineral with an ideally black color is rarer and, as a result, more valuable. That is why it is so important to buy jewelry from trusted ateliers that guarantee the authenticity of every specimen used.

In summary, the value of this remarkable stone is about much more than just the amount on the price tag. It is a combination of millions of years of geological history, ancient symbolism, masterful craftsmanship, and the emotions it evokes when it touches our skin. No matter how market charts fluctuate, its true worth lies in the beauty it can bestow on its owner.