In the case of Amethyst, possessing a medium hardness of 7 on the Moh's hardness scale with no cleavage, home ultrasonic cleaners can be used but should executed with great care. Ultrasonic cleaners can be used to clean lightly included sapphire, ruby, diamond, citrine, garnets, iolite, chrysoberyl, and unadorned jewelry but it may damage gems like topaz, peridot, emerald, pink tourmaline, pearls, coral, lapis lazuli, malachite, turquoise, and any gem that possesses a cleavage or is heavily included. 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 Amethyst 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.