The Best Stones for Engagement Rings
Diamonds are the default, but they are far from the only option. More and more clients come to us wanting a gemstone engagement ring that feels personal — a sapphire the colour of the sea, a warm ruby, a soft aquamarine, or a stone with meaning behind it.
The question we hear most is a practical one: will it last? An engagement ring is worn every day, often for a lifetime, so the stone at its centre has to stand up to real life — washing up, gym bags, car doors, small children. This guide is a jeweller's honest take on which precious stone engagement rings hold up beautifully, and which are better kept for occasional wear.
The Mohs scale, in plain English
Gemstone hardness is measured on the Mohs scale, from 1 (talc, powder-soft) to 10 (diamond, the hardest natural material). It is a scale of scratch resistance, not overall toughness — a stone can be hard and still chip — but for everyday engagement rings it is the single most useful number to know.
As a working rule at the studio, we treat Mohs 8 and above as safe for daily wear in a ring. Between 7 and 8 you can wear the stone daily with a little care and a protective setting. Below 7 the stone is beautiful but better suited to earrings, pendants or occasion pieces.
Stone by stone
Diamond — Mohs 10
The classic choice, and the hardest natural material on earth. A diamond will not scratch in normal wear and takes a knock better than almost any other stone. It works in any setting style, from a delicate solitaire to a bold bezel. If you want a colourless engagement ring you can wear and forget about, diamond is still the benchmark — natural or lab-grown, both perform identically at the bench.
Sapphire — Mohs 9
Our most-commissioned coloured stone for engagement rings, and for good reason. Sapphires are exceptionally hard, come in every colour except red (blue, teal, pink, yellow, green, peach, colourless, and the celebrated padparadscha), and pair beautifully with both yellow and white metals. Teal and pale-blue Montana sapphires have been especially popular commissions recently.
Ruby — Mohs 9
A ruby is simply a red sapphire, and shares the same excellent durability. Fine natural rubies are rarer than sapphires and priced accordingly, but a well-cut ruby in an 18ct rose or yellow gold setting makes a truly distinctive engagement ring with real heirloom potential.
Aquamarine — Mohs 7.5–8
Aquamarine sits right at the edge of what we recommend for daily wear, and it is one of the most-requested alternatives to diamond right now. The pale, watery blue is unmistakable and works especially well in cool white metals — platinum or 18ct white gold. Choose a well-protected setting (bezel or half-bezel rather than high claws) and it will wear beautifully for decades.
Spinel — Mohs 8
An underrated gemstone that deserves more attention. Natural spinels come in vivid reds, pinks, greys and steely blues, and their hardness makes them a genuinely practical everyday stone. Often more affordable than sapphires or rubies of similar colour saturation.
Topaz — Mohs 8
Hard enough for daily wear, but topaz can have distinct cleavage planes that make it more prone to chipping on a sharp knock. A protective bezel setting is essential for an engagement ring. Blue and pale-champagne topaz are the most popular colours we work with.
Emerald — Mohs 7.5–8
Emeralds are one of the most beautiful gemstones in the world, but they are also one of the most demanding. Almost every natural emerald contains internal fractures ("jardin") that make the stone brittle, and most are oil-treated to improve clarity. A bezel setting and a client who understands the care involved can make an emerald engagement ring work — but we always have that conversation first.
Morganite, tourmaline, amethyst — Mohs 7–7.5
Soft pinks, greens and purples that make lovely dress and cocktail rings, and beautiful pendants or earrings. For an engagement ring, we'd usually steer you toward a harder alternative in a similar colour — a peach sapphire instead of morganite, for example — unless the specific stone has personal meaning.
Opal, pearl — Mohs 5.5–6.5
Both are wonderful stones, and both are genuinely fragile. We love designing with them, but not for a ring you will wear every day. If you have your heart set on an opal engagement ring, we will design it — and we will be honest about the extra care it will need.
Quick comparison
| Stone | Mohs | Daily wear? |
|---|---|---|
| Diamond | 10 | Yes — the benchmark |
| Sapphire | 9 | Yes |
| Ruby | 9 | Yes |
| Spinel | 8 | Yes |
| Topaz | 8 | Yes, in a protective setting |
| Aquamarine | 7.5–8 | Yes, with care |
| Emerald | 7.5–8 | Possible — bezel setting only |
| Morganite / tourmaline | 7–7.5 | Better for occasional wear |
| Opal / pearl | 5.5–6.5 | No — occasional pieces |
Setting matters as much as hardness
Even a hard stone can be vulnerable if it's set with tall, exposed claws. For coloured stones we often recommend a bezel or half-bezel — the metal wraps around the girdle of the stone and protects its most fragile edges from knocks. It's why so many of the coloured-stone engagement rings we make have a slightly modern, sculptural silhouette. Hardness gets you most of the way; a thoughtful setting gets you the rest.
Natural or lab-grown?
We work with both. Lab-grown diamonds and sapphires are chemically and physically identical to their natural counterparts — same hardness, same brilliance — and typically cost less at the same size and quality. Natural stones carry provenance, rarity and (often) long-term value that lab-grown stones don't. Neither is the "right" answer; it depends on what matters to you. We will always be transparent about which is which.
Our honest recommendation
If you want a coloured stone you can wear every day and never think twice about, sapphire is the best stone for an engagement ring in almost every case — hard enough for a lifetime of wear, available in a colour to match almost any brief, and beautiful in every metal we work with.
If you want the colourless classic, choose a diamond — natural or lab-grown, based on your priorities. And if you fall in love with a softer stone — an emerald, a morganite, an opal — we'll design a setting that protects it and be honest with you about how to look after it.
Start a conversation
Have a stone in mind, or somewhere between three ideas? Tell us what you're drawn to and we'll help you choose the stone, setting and metal that fit the way you actually live.