Gemstone & Specimen Care Guide

Caring for Your Gemstones & Specimens

Fine gemstones and mineral specimens are remarkably durable — many have survived hundreds of millions of years inside the earth — yet they still reward thoughtful care. Different stones have very different needs, and a little knowledge will keep your collection brilliant and intact for generations.

Cleaning Loose Gemstones

For hard, untreated, single-crystal stones such as sapphire, ruby, and spinel, gentle cleaning is straightforward:

• Use lukewarm water, a drop of mild dish soap, and a soft brush. Rinse and pat dry with a lint-free cloth.
• Avoid ultrasonic and steam cleaners for emeralds, opals, tanzanite, and any oiled or fracture-filled stone — vibration and heat can damage them or remove clarity-enhancing oils.
• Emeralds in particular should only be wiped with a soft, damp cloth; never soak them, and never use detergents or solvents that could strip their oil.
• Opals contain water and dislike heat and dryness; clean only with a slightly damp cloth and never soak or use chemicals.

Caring for Mineral Specimens

Natural specimens are more fragile than faceted stones. Crystal terminations chip easily and some minerals react badly to water or light.

• Lift a specimen by its solid matrix base, never by a delicate crystal point.
• Dust hard specimens such as quartz and amethyst with a soft brush or air blower; only rinse those known to be water-stable.
• Never wet water-soluble species such as halite and selenite, or sensitive species such as calcite and malachite.
• Keep light-sensitive minerals (amethyst, fluorite, kunzite, rose quartz) out of direct sunlight to prevent fading.

Storing Jewelry & Gems

• Store each piece separately in a soft pouch or lined compartment so harder stones do not scratch softer ones — remember that a diamond or sapphire can scratch almost anything else.
• Keep stones away from prolonged direct sunlight and extremes of heat, which can fade colour in some gems and dry out opals.
• For jewelry, remove rings and bracelets before cleaning, gardening, swimming, or applying lotions and perfumes.

Hardness at a Glance

The Mohs scale (1 softest to 10 hardest) is a useful guide to durability: diamond is 10, ruby and sapphire 9, topaz 8, emerald and spinel around 7.5-8, quartz and amethyst 7, opal 5.5-6.5, and many specimen minerals far softer. The lower the hardness, the more carefully a stone must be handled and stored.

When to Seek Professional Service

Contact us at gemcare@mineralshub.co if a stone in a setting becomes loose, if an emerald appears to be drying out and could benefit from re-oiling, or if a specimen is damaged and you would like advice on stabilisation or restoration. We can arrange professional re-oiling, re-setting, and conservation for stones and specimens purchased from us.