The proper care of gemstones is very important. Because of the composition of gemstones each one is very different in hardness, toughness, reaction to heat, light, acids, cleaners, etc. Gemstones can absorb chemicals which can change their color, a hard brush used for cleaning can scratch the surface, and some gemstones are even prone to lose their brilliant color when exposed to direct sunlight for long periods of time (Kunzite - lavendar color). Taking care of your gemstone is a very important task and home maintanence is fairly easy once you know your stone. Purchasing a commercial jewelry cleaner is for the most part safe. A few stones to be careful with are: Pearl, Emerald, and Amber. The ammonia and or chemicals in the commercial cleaners can damage sensitive gems.