I’ve listed the most popular ways to clean gemstones and those stones that can be cleaned safely under that method. Mohs is the hardness of the stone- the rating is from 1 – 10 where 10 is the hardest (diamonds).
Cleaning method: Steaming
Gem Name and Mohs Rating
Jade, Jadeite 6 1/2 - 7
Jade, Nephrite 6 - 6 1/2
Cubic Zirconia (CZ) 8 1/2
Rhodonite 5 1/2 - 6 1/2
Aquamarine 7 1/2 - 8
Alexandrite 8 1/2
Ruby 9
Sapphire 9
Diamond 10
Spinel 8
Cleaning method: Ultrasonic
Jade, Jadeite 6 1/2 - 7
Jade, Nephrite 6 - 6 1/2
Cubic Zirconia (CZ) 8 1/2
Carnelian 7
Citrine 7
Garnet 7 - 7 1/2
Amethyst 7
Rhodonite 5 1/2 - 6 1/2
Aquamarine 7 1/2 - 8
Alexandrite 8 1/2
Ruby 9
Sapphire 9
Diamond 10
Spinel 8
Cleaning method: Boiling
Jade, Jadeite 6 1/2 - 7
Jade, Nephrite 6 - 6 1/2
Cubic Zirconia (CZ) 8 1/2
Diamond 10
Cleaning method: Soap
Amazonite 6 - 6 1/2
Fluorite 4
Labradorite 6 - 6 1/2
Moonstone 6 - 6 1/2
Rainbow Moonstone 6 - 6 1/2
Sunstone 6 - 6 1/2
Sodalite 5-6
Apatite 5
Howlite 3 - 3 1/2
New ''Jade'' 2 1/2 - 6
Olive ''Jade'' 2 1/2 - 6
Serpentine 2 1/2 - 6
Malachite 3 1/2 - 4
Diopside 5 1/2 - 6
Shell 3 1/2
Jade, Jadeite 6 1/2 - 7
Jade, Nephrite 6 - 6 1/2
Cubic Zirconia (CZ) 8 ½
Iolite 7 - 7 1/2
Lapis Lazuli 5 - 6
Tourmaline 7 - 7 1/2
Kyanite 4 - 7 1/2
Opal 5 - 6 1/2
Tanzanite 6 - 7
Topaz 8
Zircon 6 - 7 1/2
Emerald 7 1/2 - 8
Turquoise 5-6
Coral 3 1/2 - 4
Carnelian 7
Citrine 7
Garnet 7 - 7 1/2
Amethyst 7
Aquamarine 7 1/2 - 8
Alexandrite 8 1/2
Sapphire 9
Spinel 8
Diamond 10
Rhodochrosite 3 1/2 - 4 1/2 Cool Soapy Water
Calcite 3 Cool soapy water is safe
Rhodonite 5 1/2 - 6 1/2 Warm Soapy Water
Amber 2 - 2 1/2 Warm soapy water is safe.
Do not use a brush because it may leave scratches
Cleaning method: Untreated cloth
Alexandrite 8 1/2
Amazonite 6 - 6 1/2
Amber 2 - 2 1/2
Amethyst 7
Apatite 5
Aquamarine 7 1/2 - 8
Aragonite 3 1/2 - 4
Calcite 3
Carnelian 7
Citrine 7
Coral 3 1/2 - 4
Cubic Zirconia (CZ) 8 1/2
Diamond 10
Diopside 5 1/2 - 6
Emerald 7 1/2 - 8
Fluorite 4
Garnet 7 - 7 1/2
Howlite 3 - 3 1/2
Iolite 7 - 7 1/2
Jade, Jadeite 6 1/2 - 7
Jade, Nephrite 6 - 6 1/2
Kyanite 4 - 7 1/2
Labradorite 6 - 6 1/2
Lapis Lazuli 5 - 6
Malachite 3 1/2 - 4
Moonstone 6 - 6 1/2
New ''Jade'' 2 1/2 - 6
Olive ''Jade'' 2 1/2 - 6
Opal 5 - 6 1/2
Pearl 2 1/2 - 4
Peridot 6 1/2 - 7
Rainbow Moonstone 6 - 6 1/2
Rhodochrosite 3 1/2 - 4 1/2
Rhodonite 5 1/2 - 6 1/2
Ruby 9
Sapphire 9
Serpentine 2 1/2 - 6
Shell 3 1/2
Sodalite 5-6
Spinel 8
Sunstone 6 - 6 1/2
Tanzanite 6 - 7
Topaz 8
Tourmaline 7 - 7 1/2
Turquoise 5-6
Zircon 6 - 7 1/2
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