In the case of Tanzanite, possessing a medium hardness of 6.5 to 7 on the Moh’s hardness scale with perfect cleavage, home ultrasonic cleaners should not be used. Ultrasonic cleaners can be used to clean lightly included sapphire, ruby, diamond, amethyst, citrine, garnets, iolite, chrysoberyl, and unadorned jewelry but it may damage gems like emerald, pink tourmaline, pearls, coral, lapis lazuli, malachite, turquoise, and any gem that has many inclusions. When in doubt, don’t use it, and as always consult a local reputable jeweler before attempting any cleaning yourself.
To protect the beauty of your gems and jewelry, make sure you store each piece separately. Gems may scratch each other or the metal in your jewelry. Avoid creating a tangle of jewelry by wrapping each piece individually or keeping it in its own compartment. Especially when you travel, make sure your jewelry pieces don’t jostle each other in one bag.
Gemstones are among the most durable of nature’s creations. With a little care, they will be as beautiful for generations to come as they are today.