Whether a gemstone can survive daily life on your finger, or needs to be tucked safely in a drawer, comes down largely to one number: its hardness on the Mohs scale. It’s the single most useful fact to know before you buy a stone for a ring, store your collection, or clean anything — and yet it’s the thing most beginners overlook until a favorite piece picks up its first scratch.
This guide explains the Mohs scale in plain terms, gives you a full hardness chart for 60+ popular stones, and shows you how to use that number to make smart choices about jewelry and care. Bookmark it — it’s the kind of reference you’ll come back to every time you add a stone.
What Is the Mohs Hardness Scale?
The Mohs scale, created by mineralogist Friedrich Mohs in 1812, ranks a mineral’s resistance to scratching from 1 (softest) to 10 (hardest). Each mineral can scratch anything below it and be scratched by anything above it. Talc sits at 1, diamond at 10.
The scale isn’t evenly spaced — the jump from 9 (corundum, like sapphire) to 10 (diamond) is far larger than the steps lower down — but as a practical ranking for everyday use, it’s exactly what you need.
The most useful rule of thumb to remember: everyday dust contains quartz, which is a 7. That means any stone softer than 7 can slowly be scratched just by being wiped with a dusty cloth or rubbed during normal wear. It’s why a hardness of 7 or above is the rough cutoff for low-maintenance jewelry.
Hardness vs. Toughness (They’re Not the Same)
This trips up a lot of people, so it’s worth thirty seconds. Hardness is scratch resistance. Toughness is resistance to chipping, cracking, or breaking. They’re different properties.
Diamond is the hardest natural material (10) yet can chip if struck at the wrong angle. Jade is only about 6.5 but is exceptionally tough — historically carved into tools because it resists breaking. So a “hard” stone isn’t automatically unbreakable, and a softer stone isn’t automatically fragile. Hardness tells you about scratching; keep toughness in mind for impact.
The Complete Gemstone Hardness Chart
Stones are listed from softest to hardest, with a quick note on durability and care. Many natural stones vary slightly, so ranges are given where appropriate.
| Stone | Mohs hardness | Durability & care notes |
|---|---|---|
| Selenite | 2 | Very soft; dissolves in water; display/handling only |
| Amber | 2–2.5 | Soft, organic; scratches easily; avoid chemicals |
| Lepidolite | 2.5–4 | Soft; keep away from water and knocks |
| Pearl | 2.5–4.5 | Organic; soft; avoid chemicals, perfume, water |
| Calcite (incl. orange/blue) | 3 | Soft; reacts to acids; no water cleansing |
| Coral | 3–4 | Organic; soft; protect from chemicals |
| Howlite | 3.5 | Soft and porous; often dyed; handle gently |
| Azurite | 3.5–4 | Soft, sensitive; no water |
| Malachite | 3.5–4 | Soft; toxic dust if cut; never put in water |
| Rhodochrosite | 3.5–4 | Soft; protect from scratches and acids |
| Fluorite | 4 | Soft for jewelry; fades in sun; cleaves easily |
| Larimar | 4.5–5 | Moderate; protect from knocks |
| Lapis lazuli | 5–5.5 | Moderate; porous; avoid water and chemicals |
| Apatite | 5 | Moderate; brittle; protective settings only |
| Obsidian | 5–5.5 | Glass; can chip; moderate scratch resistance |
| Hematite | 5–6 | Moderate; can chip; keep dry to avoid rust |
| Turquoise | 5–6 | Porous; avoid water, oils, chemicals |
| Moldavite | 5.5–6 | Natural glass; handle with care |
| Opal | 5.5–6.5 | Contains water; can crack if too dry; gentle care |
| Sodalite | 5.5–6 | Moderate; protect from scratches |
| Moonstone | 6–6.5 | Can cleave; protective settings for rings |
| Labradorite | 6–6.5 | Moderate; avoid hard knocks |
| Amazonite | 6–6.5 | Moderate; can cleave; gentle handling |
| Sunstone | 6–6.5 | Moderate; everyday wear with some care |
| Pyrite | 6–6.5 | Keep dry; can tarnish/rust |
| Nephrite jade | 6–6.5 | Lower hardness but very tough |
| Tanzanite | 6–7 | Brittle; not ideal for daily rings |
| Jadeite jade | 6.5–7 | Tough and durable; good for jewelry |
| Peridot | 6.5–7 | Moderate; avoid hard knocks |
| Kunzite | 6.5–7 | Fades in sun; cleaves; gentle wear |
| Zircon | 6.5–7.5 | Good but edges can abrade |
| Garnet | 6.5–7.5 | Durable; good everyday stone |
| Quartz family (amethyst, citrine, rose & clear quartz, smoky quartz) | 7 | Durable; great for everyday jewelry |
| Agate, jasper, carnelian, onyx, aventurine, tiger’s eye | 7 | Durable chalcedony/quartz; everyday-friendly |
| Iolite | 7–7.5 | Durable but can cleave |
| Tourmaline | 7–7.5 | Good durability for most jewelry |
| Aquamarine | 7.5–8 | Hard and durable; excellent for rings |
| Emerald | 7.5–8 | Hard but often included/brittle; some care |
| Morganite | 7.5–8 | Hard and durable; great for jewelry |
| Spinel | 8 | Very durable; underrated ring stone |
| Topaz | 8 | Hard but cleaves; settings should protect it |
| Cubic zirconia | 8–8.5 | Durable lab stone |
| Alexandrite / chrysoberyl | 8.5 | Excellent durability |
| Ruby (corundum) | 9 | Extremely durable; ideal for daily wear |
| Sapphire (corundum) | 9 | Extremely durable; ideal for daily wear |
| Moissanite | 9.25–9.5 | Near-diamond durability |
| Diamond | 10 | Hardest natural material; can still chip on impact |
How to Use This Chart
Choosing a stone for a ring. Rings take the most abuse, so favor stones at 7 and above — quartz, garnet, tourmaline, beryls (aquamarine, morganite), spinel, sapphire. Softer or cleavage-prone stones (opal, moonstone, tanzanite, emerald) can absolutely be worn, but choose protective settings and treat them gently. Earrings, pendants, and brooches see far less wear, so softer stones are much safer there.
Storing your collection. Harder stones scratch softer ones, so don’t toss everything in one pouch. Wrap softer pieces separately, and never let a diamond or sapphire rattle against an opal or pearl.
Cleaning safely. Hardness and water-sensitivity together decide how you clean a stone. Many soft stones are also porous or water-soluble — selenite, malachite, turquoise, pyrite — and should never go near water. For the full method-by-method breakdown, see how to cleanse crystals, and for the water question specifically, which crystals can and can’t go in water.
Frequently Asked Questions
What is the hardest gemstone?
Diamond, at 10 on the Mohs scale — the hardest natural material known. Among more affordable stones, moissanite (9.25–9.5) and the corundum gems sapphire and ruby (both 9) are extremely hard and excellent for everyday wear.
What hardness is good for everyday jewelry?
A hardness of 7 or higher is the general benchmark, because everyday dust contains quartz (7) and can scratch anything softer over time. Stones below 7 can still be worn — especially in earrings or pendants — but rings benefit from harder, tougher stones and protective settings.
Is a harder gemstone always more durable?
Not necessarily. Hardness measures scratch resistance, not resistance to chipping or breaking. Diamond is the hardest stone yet can chip on impact, while jade is much softer but very tough. Consider both properties for jewelry you’ll wear hard.
Can soft stones be worn as jewelry?
Yes, with care. Soft stones like opal, turquoise, and moonstone make beautiful jewelry but do best in protective settings, in pieces that take less impact, and with gentle cleaning. Save them from daily rough wear and they’ll last for years.
Where to Go From Here
Hardness is the quiet fundamental behind every smart buying and care decision you’ll make. Keep this chart handy: check a stone’s number before you set it in a ring, store it, or clean it, and you’ll avoid the most common ways collections get damaged.
From here, learn to care for your stones safely with how to cleanse crystals and how to charge crystals, double-check sensitive stones against which crystals can and can’t go in water, and if you’re choosing a stone to wear, see how to buy gemstones online without getting scammed. New to all of this? Start with our beginner’s guide to healing crystals.
What’s the softest stone in your collection — and how do you keep it safe? Tell me in the comments.
