Gemstone Care: What You Can and Can't Do

The Mistake That Cost $5,000

A woman once wore her treasured opal ring while doing dishes—just once. The sudden temperature change caused the stone to crack right down the middle. What she didn't know was that opals contain up to 20% water and are extremely sensitive to thermal shock. This expensive lesson highlights a crucial truth: not all gemstones are created equal when it comes to durability.

Understanding the Mohs Scale: Your First Line of Defense

Before we dive into dos and don'ts, you need to know about the Mohs hardness scale. Developed in 1812 by German mineralogist Friedrich Mohs, this scale ranks minerals from 1 (talc, the softest) to 10 (diamond, the hardest). This number tells you how easily your gemstone can be scratched—and scratches are forever.

Here's what you're working with:

Diamonds, sapphires, and rubies (8-10): The tough crowd
Emeralds, aquamarine, and topaz (7.5-8): Moderately durable
Opals, pearls, and turquoise (2.5-6.5): The delicate ones

What You CAN Do

Store Them Separately

Each gemstone should have its own space. A diamond (hardness 10) can easily scratch a pearl (hardness 2.5) if they're tumbling together in a jewelry box. Use individual soft pouches or a compartmentalized jewelry box with fabric lining.

Clean Most Stones with Mild Soap

For diamonds, sapphires, rubies, and other hard stones (7+ on Mohs scale), warm water with a few drops of dish soap works beautifully. Use a soft toothbrush to gently scrub away oils and dirt. Rinse thoroughly and pat dry with a lint-free cloth.

Take Them to Professionals Annually

Professional jewelers can deep-clean your pieces and check for loose settings. This yearly checkup can prevent the heartbreak of losing a stone—about 15% of gemstone losses happen because prongs wore down gradually without the owner noticing.

Wear Your Durable Stones Daily

Diamonds, sapphires, and rubies can handle everyday wear. They're perfect for engagement rings and daily jewelry because they resist scratching and can tolerate normal life activities.

What You CAN'T Do (Or Shouldn't!)

Never Use Ultrasonic Cleaners on Soft Stones

Those buzzing ultrasonic cleaners at jewelry stores? They're fantastic for diamonds but can literally shake apart emeralds, opals, pearls, and tanzanite. The vibrations can exploit existing fractures or damage the stone's structure.

Don't Expose Pearls and Opals to Chemicals

Your perfume, hairspray, and even hand lotion are enemies to organic gems. Pearls, made of calcium carbonate, can actually dissolve when exposed to acidic substances. The rule: pearls and opals should be the last thing you put on and the first thing you take off.

Avoid Temperature Extremes with Porous Stones

Opals, turquoise, and lapis lazuli are porous—meaning they have tiny holes that can absorb liquids and are sensitive to temperature changes. Never wear them in hot tubs, saunas, or while washing dishes. The thermal shock can cause cracking or "crazing" (fine surface cracks).

Don't Wear Soft Stones During Physical Activity

Emeralds, despite being relatively expensive, are actually quite brittle due to their natural inclusions. Remove them before gardening, exercising, or cleaning. The same goes for opals and pearls—save them for occasions where they won't take a beating.

Your Gemstone Survival Guide

Think of gemstone care like skincare—different types need different treatment. Know your stone's hardness level, understand its vulnerabilities, and adjust your habits accordingly. When in doubt, take it off. Your future self (and your jewelry investment) will thank you.

Remember: the most beautiful gemstone is one that lasts a lifetime, and that longevity depends entirely on how you treat it today.

Gemstone Care: What You Can and Can't Do