Learn what the Mohs hardness scale is and how it affects your jewelry. Discover gemstone durability rankings with Martin Busch Jewelers in NYC.
What’s the Mohs Hardness Scale?
If you’ve ever wondered how durable your gemstone jewelry is, the answer lies in something called the Mohs Hardness Scale. This scientific scale measures how resistant a mineral or gemstone is to scratching — and it’s a vital factor in jewelry care, especially for everyday wear.
At Martin Busch Jewelers, we believe in educating our customers so they can choose pieces that not only shine beautifully but also stand the test of time. Let’s break down what the Mohs scale is and why it matters when picking your next piece of fine jewelry.
What Is the Mohs Hardness Scale?
The Mohs Hardness Scale, developed by Friedrich Mohs in 1812, ranks minerals on a scale from 1 (softest) to 10 (hardest). It helps determine how easily one mineral can scratch another.
Here’s a simple version of the scale:
| Mohs Rating | Gemstone or Material | Durability |
|---|---|---|
| 10 | Diamond | Extremely Hard |
| 9 | Sapphire, Ruby | Very Hard |
| 8 | Topaz | Hard |
| 7 | Quartz, Amethyst, Citrine | Moderate-Hard |
| 6 | Feldspar, Moonstone | Medium |
| 5 | Apatite | Medium-Soft |
| 4 | Fluorite | Soft |
| 3 | Calcite | Very Soft |
| 2 | Gypsum | Very Soft |
| 1 | Talc | Extremely Soft |
Why the Mohs Scale Matters for Jewelry
Knowing the hardness of a gemstone helps you:
Choose the Right Jewelry for Everyday Wear
Stones like diamonds (10), sapphires, and rubies (9) are ideal for engagement rings or jewelry you wear daily. They’re less likely to scratch or chip.
Care for Softer Stones Properly
Gems like opals, pearls, and turquoise fall lower on the scale. They’re beautiful but require gentle handling and should be reserved for special occasions.
Understand Cleaning Limitations
Softer gemstones shouldn’t go into an ultrasonic cleaner (see our guide here) as the vibrations can damage them.
Jewelry Care Based on Mohs Scale
Here’s how to care for jewelry based on hardness:
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9–10 (Very Hard): Ideal for daily wear. Safe for most cleaning methods.
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7–8 (Moderate): Great for regular wear. Clean with mild soap and soft cloth.
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6 and below (Soft): Avoid water, chemicals, and impact. Store separately and wear with care.
Shop Durable Fine Jewelry at Martin Busch Jewelers
Whether you're shopping for a diamond engagement ring or a delicate birthstone pendant, our team will help you find a piece that suits your style and your lifestyle. We offer expert advice on gemstone durability, so your investment remains beautiful for years to come.
Why Choose Martin Busch Jewelers in NYC?
With over 60 years of experience in the New York City jewelry scene, we provide not just exceptional jewelry — but the knowledge you need to wear and care for it with confidence.
Stop by our Financial District showroom or shop online to discover expertly crafted pieces and personalized service you can trust.