Men's Gemstone Rings: Onyx, Opal and Tiger's Eye Explained

A plain band does the job, but a stone gives a ring a focal point. Black onyx reads sharp and formal. Tiger's eye has a warm golden brown that catches the light. An opal or crystal inlay adds colour without shouting. This guide covers the stones we actually use at Manful, what each one looks like on the hand, and how to pick a size and keep it looking right.

One thing up front, because it changes what you should expect. Not every dark ring is a gemstone ring, and not every "opal" is a mined stone. We are specific below about which of our rings hold a genuine stone and which use a coloured band or a man-made inlay. That distinction matters for both the look and the care.

What counts as a gemstone ring

Three different things get sold under the same heading, so it helps to separate them.

• A set natural stone. A real piece of onyx or tiger's eye cut and fixed into the band. Every tiger's eye is slightly different because the banding in the stone is natural.
• A man-made inlay. A synthetic fire opal or crystal strip set into the metal. It gives you the colour and shine of an opal at a lower price, and it holds up better to daily knocks than a soft natural opal would.
• A coloured band with no set stone. Our Black Onyx Band, for example, is not a piece of onyx. It is black plated steel finished to that same deep onyx black. It is a good everyday ring, just not a stone-set one.

All three are worth owning. The point is only to know which is which before you buy.

Onyx: the sharp black stone

Onyx is a black form of chalcedony, prized for its flat, even colour. It has long carried a reputation for strength and steadiness, which is part of why it reads so well on a man's hand. There is nothing fussy about it.

Our onyx rings set a genuine black onyx into a 316L stainless steel signet. The Onyx Signet Ring comes in a silver-tone or gold-tone finish, at a 16mm face and a comfort-fit band, in US sizes 7 to 13. If you want a different shape, the Onyx Hexagon Signet keeps the same stone in a six-sided face. Both sit at £25.99.

Onyx suits you if you want one ring that works at the office and out at the weekend. The black face is formal enough for a suit and plain enough that it never looks like it is trying too hard.

Tiger's eye: the stone that varies

Tiger's eye is the golden brown stone with a moving band of light across it, an effect called chatoyancy. Because that banding forms naturally, no two stones are the same, so your ring is genuinely one of one. It is often linked with confidence and courage, which is the kind of association that makes it a good gift with a bit of meaning behind it.

Our Tiger's Eye Signet Ring sets a 9mm by 13mm tiger's eye stone into a 316L steel signet, silver-tone at £25.99 or gold-tone at £26.99, in US sizes 7 to 12. Since each stone differs, the one you receive will not look identical to the photo, and that is the appeal rather than a fault.

Tiger's eye is warmer than onyx, so it pairs more easily with brown leather, tan boots and earthy tones than with an all-black outfit.

Opal and crystal: colour without the price of a mined stone

Natural opal is beautiful and also soft, expensive and easily damaged, which is why you rarely see it in an everyday men's ring. Our approach is to give you the opal look in a form built for daily wear.

The Blaze Crystal Ring and Blue Crystal Ring use a synthetic fire opal and crystal inlay set into a black plated steel band, one in bright red and one in blue, both at £21.99 in US sizes 6 to 13. If you prefer a heavier ring, the Tungsten Red Opal Inlay Band runs a red opal inlay down a tungsten band, which is one of the hardest ring materials you can wear. Either way you get the play of colour without paying for, or babying, a mined opal.

Shell stones: abalone and mother of pearl

If you like the idea of a stone but want something lighter and more iridescent, the shell signets are worth a look. The Abalone Shell Signet sets a strip of synthetic abalone under resin, so it shifts through greens and blues as it moves, and each one is unique. The Mother of Pearl Signet gives a softer pearl-white shimmer. Both use the same 316L steel signet base as the onyx rings and sit around £25.99.

What our gemstone rings are made of

The band matters as much as the stone, so here is the plain version.

Almost every ring above is built on 316L stainless steel, the same watch-grade steel that resists rust, does not turn skin green and is hypoallergenic. The exception is the opal inlay band, which is tungsten for extra hardness. Finishes are silver-tone steel, black IP plating or gold-tone plating over the steel. None of these rings use solid gold or sterling silver, so you get the look at a fraction of the cost and none of the tarnishing.

Sizing runs in US ring sizes, mostly 6 to 13 depending on the ring. If you are not sure of your size, our ring size guide shows how to measure at home and convert to US sizing.

How to choose and wear one

Match the stone to the rest of your look. Onyx and the black bands sit best with black, grey and formal wear. Tiger's eye and the shell rings lean warmer, so they work with browns, denim and casual outfits. The crystal rings are the loud option if you want colour to be the point.

Keep it to one statement ring per hand. A signet on the little finger or ring finger is plenty. If you already wear a wedding band, put the gemstone ring on the other hand rather than stacking the two. Most of our stone signets have a wide face, so they carry the look on their own.

Caring for a gemstone ring

The steel band is waterproof and low maintenance, but a natural stone deserves a little more thought than a plain band.

• Wipe the stone and band with a soft, slightly damp cloth. That handles most day-to-day dulling.
• Skip ultrasonic cleaners and harsh chemical dips. They are made for hard gems and can loosen a set stone or dull a shell inlay.
• Take the ring off before heavy lifting, DIY or the gym so you do not chip the stone against hard surfaces.
• Store it in the velvet gift bag it arrives in rather than loose in a drawer, so the face does not get scratched.

Do that and an onyx or tiger's eye ring will look the same in a couple of years as it did on day one.

Frequently asked questions

Are Manful's onyx and tiger's eye rings real stones?
Yes. The Onyx Signet and Tiger's Eye Signet both hold a genuine set stone. Because tiger's eye forms its banding naturally, each ring is slightly different from the next.

Is the opal a real opal?
No, and we would rather be straight about it. Our opal look comes from a synthetic fire opal inlay on the crystal rings, or a red opal inlay on the tungsten band. Man-made inlays hold up far better to daily wear than a soft mined opal.

Will a gemstone ring turn my finger green?
No. The bands are 316L stainless steel or tungsten, both of which resist rusting, greening and fading, and are hypoallergenic.

Can I wear it in the shower or swimming?
The band and steel setting are waterproof, so a splash is fine. For a natural stone we would still take it off for long soaks, hot tubs and chlorinated pools to keep the finish sharp.

What size should I order?
Our stone rings run US sizes, usually 6 to 13. Measure first with our ring size guide and order the nearest US size.

Ready to pick one? Browse the full gemstone collection or the wider men's rings range. If you like the stone-in-a-flat-face look in particular, most of these sit in our signet rings, and our signet ring guide goes deeper on how to wear that style.