While most gemstones, appear to be unbreakable, they are still likely to be damaged with improper wear and care. Stones like Amethyst, Emerald and Tanzanite can be easily scratched, chipped or shattered with hard knocks and excessive changes in temperature. Emeralds can have an oily appearance, and care should be taken when cleaning to not remove this surface treatment. Most stones can be cleaned using warm water, gentle detergents and a soft toothbrush. Ensure that the stone is rinsed well and can be dried with a soft cloth. Avoid harsh chemicals with gemstones as they can alter the colour of some and effect the durability of others. When storing gemstone jewellery it is recommended to keep with either in individual soft fabric pouches or in a jewellery box with dividers so the stones are protected from contact with each other.