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Cleaning and Care

This chart provides generalizations of recommended care of gemstones. Fractures, even those unseen by the eye, can crack when you attempt to clean with ultrasonic or steam based cleaners. Your safest method is a soft brush, soap and water.


Gemstone Mohs Hardness Steam Ultrasonic
Alexandrite 8.5 Usually Usually
Amethyst 7 Never Usually
Apatite 4.5 Never Not Recommended
Aquamarine 7.5-8 Usually Usually
Chalcedony 6.7-7 Usually Usually
Citrine 7 Never Usually
Coral 3.5-4 Never Never
Diamond 10 Usually Usually
Diopside 5.5-6 Never Never
Emerald 7.5-8 Never Never
Garnet 7-7.5 Never Usually
Iolite 7-7.5 Never Never
Jade 6-6.5 Not Recommended Not Recommended
Labradorite 6-6.5 Not Recommended Not Recommended
Lapis 5-5.5 Never Never
Malachite 3.5-4 Never Never
Moonstone 6-6.5 Not Recommended Not Recommended
Morganite 7.5-8 Usually Usually
Opal 5-6.5 Never Never
Pearl 2.5-4.5 Never Never
Peridot 6.5-7 Never risky
Quartz 7 Never Usually
Ruby 9 Usually Usually
Sapphire 9 Usually Usually
Tanzanite 6-7 Never Never
Topaz 8 Never Never
Tourmaline 7-7.5 Never Never
Turquoise 5-6 Never Never


                                         * source - GIA (Gemological Institute of America).