Tanzanite is a rare gemstone that is lovely, valuable -- and delicate. Cleaning tanzanite jewelry isn't difficult, but it requires great care to avoid damaging the stone.
Fill a plastic container with distilled water at room temperature. Water that is either too hot or too cold can cause tanzanite to crack. Avoid tap water, which can leave residue on the stone.
Add a few drops of mild dishwashing liquid to the water. Carefully place the jewelry in the water; don't let the stone bump the bottom or sides of the container. Let the jewelry soak for 10 to 20 minutes.
Dip a soft-bristled toothbrush into the soapy water and scrub the stone gently. Use the softest toothbrush available to avoid scratching the stone while removing residue. Wash the rest of the jewelry piece with the soapy water as well.
Rinse the piece of jewelry with clean distilled water at room temperature. Dry the piece carefully with a soft cloth.