Preserving the Polish

A lapidary artist spends hours meticulously cutting and polishing a stone to achieve a flawless, liquid-glass finish. However, that perfect finish can be ruined in seconds by improper handling, aggressive cleaning, or careless storage.

Proper gemstone care starts with understanding that not all gems can be treated equally. The chemical and physical properties of a Diamond are vastly different from those of an Opal, and treating them the same way will end in disaster.

Here is the master guide to maintaining the brilliance of your gem collection.

1. Cleaning Your Gemstones

Dust, fingerprints, and ambient oils can quickly dull the sparkle of a faceted gem or the luster of a cabochon.

The Safest Universal Cleaning Method

When in doubt, the absolute safest way to clean any gemstone is:

  1. Warm (not hot) water.
  2. A few drops of mild, unscented dish soap (like Dawn).
  3. A very soft-bristled baby toothbrush or a lint-free microfiber cloth.
  4. Gentle scrubbing, followed by a thorough rinse and pat-dry.

Cleaning gems manually with a soft brush and mild soap

The Danger of Ultrasonic Cleaners

Ultrasonic cleaners use high-frequency sound waves to create microscopic bubbles that rapidly collapse, literally blasting dirt out of tight jewelry settings.

While highly effective, ultrasonic cleaners can destroy certain gemstones.

DO NOT use ultrasonic cleaners on:

  • Emeralds: Almost all emeralds are fracture-filled with oil. The ultrasonic waves will vibrate the oil right out of the stone, turning it cloudy and cracked.
  • Opals and Pearls: These are porous and contain water/organic material. The intense vibrations can shatter them.
  • Tanzanite, Fluorite, and Apatite: These stones are highly prone to cleavage (splitting) when subjected to thermal shock or intense vibration.
  • Turquoise and Malachite: These are soft and porous.

Ultrasonic cleaners are powerful but dangerous for soft or treated gems

2. Chemical Hazards

Many collectors do not realize that common household items can permanently damage certain gemstones.

  • Acids (Vinegar, Lemon Juice): Any carbonate stone (like Malachite, Calcite, or Pearls) will literally dissolve and fizz if exposed to acids.
  • Ammonia (Windex/Glass Cleaners): Ammonia can bleach or damage treated stones and organic gems like coral or pearl.
  • Hairspray and Perfume: The alcohol and chemicals in cosmetics can permanently dull the surface of porous stones like Turquoise. Always put your jewelry on after applying cosmetics.

3. Storing Your Gems (The Hardness Rule)

Storage is equally as important as cleaning. The golden rule of gem storage is based on the Mohs Scale of Hardness.

A harder stone will always scratch a softer stone. If you toss a Sapphire (Mohs 9) and an Amethyst (Mohs 7) loose into the same velvet bag, the Sapphire will act like sandpaper against the Amethyst, leaving it covered in micro-scratches.

Using partitioned gem trays and individual padded jars for safe storage

Best Storage Practices

  1. Isolation: Store stones of different hardness separately. The best method for a collection is using partitioned gem trays filled with individual, foam-padded acrylic gem jars.
  2. Gem Parcels: Traditional gem dealers use "gem parcels"—specially folded acid-free paper envelopes with inner soft linings.
  3. Humidity Control: Opals contain up to 20% water. If stored in a bone-dry safe, they can "craze" (develop internal cracks as they dry out). Some collectors keep a small, damp piece of cotton in the storage box with their opals. Conversely, Pyrite (Fool's Gold) can develop "Pyrite Disease" and crumble if stored in a highly humid environment.
  4. Light Exposure: Certain stones are photosensitive and will fade if left in direct sunlight for long periods. Amethyst, Kunzite, and some Topaz should be stored in the dark when not being displayed.

By treating your collection with respect and understanding the chemistry of the stones you own, your lapidary creations and gem investments will retain their flawless polish for generations to come.