What is onyx?
Onyx is a variety of agate, prized for its deep black color, opacity, and vitreous luster when polished.
What are this stone's characteristics?
Although the collective imagination immediately associates this gemstone with a solid black hue, the natural stone often exhibits parallel black and white bands. However, in contemporary jewelry, it is the entirely black version that is most sought after for its depth and its ability to reflect light. It is an opaque material distinguished by its hardness of 7 on the Mohs scale, which makes it robust enough for daily wear without fear of excessive scratching.
Compared to other black precious or fine stones like jet or obsidian, it offers superior density and brilliance. Its smooth texture allows jewelers to cut it into various shapes, from domed cabochons to complex geometric facets.
Why is onyx so popular for men's collections?
The aesthetic appeal of this stone lies in the powerful contrast it creates with precious metals. Its intense black particularly highlights the brilliance of yellow gold rings or the cool shimmer of silver and white gold. Today, this gemstone remains a popular choice for several types of jewelry:
- Signet rings and men's rings, which benefit from its understated and masculine appearance.
- Vintage or geometric style lockets and pendants.
- Diamond-paved pieces, where the black stone serves as a backdrop to maximize the brilliance of white stones.
How to recognize real onyx?
Onyx is often confused with black agate, spinel, or glass, which do not have the same value or structure. Here are the distinguishing criteria:
- Structure and patterns: The presence of fine striations, sometimes invisible to the naked eye without a magnifying glass, is the distinguishing sign of onyx.
- Typical finishes: It generally presents a brilliant mirror polish, but can also be matte for a velvet effect.
- Frequent confusions: Beware of common imitations or identification errors such as black agate, obsidian, black spinel, or tinted glass.
Frequently asked questions about onyx
Yes, it is a natural stone from the quartz family. Please note, however, that the vast majority of solid black stones used in jewelry undergo heat treatment or traditional dyeing to standardize their color, a common and accepted practice.
With a hardness of 7 out of 10, this stone is durable enough for an engagement ring, but it is less hard than sapphire or diamond. Violent impacts that could crack its surface should be avoided.
Since antiquity, onyx has been revered as a powerful protective stone. The Greeks and Romans used it as a shield against evil and to instill courage, while the Egyptians fashioned it into amulets to ward off negativity and protect the wearer.