The Best Gemstones for Engagement Rings, Ranked by Durability

An engagement ring is not like other jewellery. It's worn every day, knocked against doorframes and steering wheels, immersed in hand-washing and gardening and life — for decades. So while a pendant can carry almost any stone safely, an engagement ring demands something more specific: durability.

That's the honest starting point for choosing a coloured gemstone for an engagement ring. Beauty matters, of course — but a stone that can't survive daily wear will break your heart, sometimes literally. Here's how the popular choices rank, and what durability really means.

What 'durability' actually means

Durability is really three things: hardness (resistance to scratching, measured on the Mohs scale from 1 to 10), toughness (resistance to chipping and breaking), and stability (resistance to heat, light and chemicals). Hardness gets the most attention because it's the easiest to compare — a harder stone scratches a softer one, and anything ranked below about 7 on the Mohs scale will pick up surface wear from the quartz dust that's simply in the air.

For a ring worn daily, we generally counsel clients toward stones ranked 8 or above, or to choose a protective setting if their heart is set on something softer.

The everyday champions: diamond, sapphire, ruby

Diamond (Mohs 10) is the hardest natural material on earth — the traditional choice precisely because it shrugs off a lifetime of wear. But the coloured-stone champions are close behind: sapphire and ruby (both Mohs 9), which are the same mineral, corundum, in different colours.

A sapphire — in classic blue or in pink, yellow, teal or white — is our most recommended coloured stone for engagement rings, offering superb durability with genuine individuality. Ruby, its red sibling, is equally hard and carries a romance all its own. Either will serve a lifetime of daily wear beautifully.

Beautiful, but handle with care

Below the champions sit stones that can work in an engagement ring with the right expectations and setting. Spinel and topaz (Mohs 8) are reasonably hard and often overlooked; aquamarine and morganite (7.5–8) are beloved for their soft colour and can serve well in a protective setting with mindful wear; tourmaline (7–7.5) offers extraordinary colour range.

Emerald deserves special mention. Though hard (7.5–8), it's typically included and brittle — prone to chipping if knocked. We do make emerald engagement rings, but with protective settings and honest counsel about the care they need. It's a stone for someone who loves it enough to treat it gently.

Stones better saved for other jewellery

Some beautiful stones simply aren't suited to a ring worn daily. Opal (5.5–6.5) is soft and sensitive to drying and impact; pearl (2.5–4.5) is softer still and best in rings worn occasionally rather than every day. These make stunning pendants, earrings and dress rings — just not the ring you'll wear while gardening for the next forty years.

This isn't snobbery; it's kindness to the stone and to you. The right gem in the right piece will outlast and outshine the wrong one forced into a role it can't fill.

Choosing with clear eyes

If your heart is set on colour for an engagement ring, come and talk it through. We'll show you the durable options in natural light, explain the settings that protect more delicate stones, and help you choose something you'll love wearing daily — not just admiring in the box.

The most beautiful engagement ring is the one still beautiful on your fiftieth anniversary.