I often use natural gemstones mined from the earth. These gemstones could be hundreds or even thousands of years old. Natural gemstones of the same family don't all look the same; some are lighter; some are darker in color. Some have a variety of marks or colors on them either from the mining process or from the way the gemstone grew. These differences are all natural and should be expected. 

Leather jewelry can last for a long time if it is maintained properly. Leather jewelry must be protected from dust, water, and salt so don't wear when showering or while swimming..

Pat down the leather with a damp cloth. Avoid using a wet cloth or immersing the leather in water. Put a small dab of mild, moisturizing hand soap or leather cleaner on the cloth on both sides. Rinse and dampen the cloth with clean water and wipe the leather clean & dry.

Suede should not be cleaned with water as the water might change the dyes used. Clean suede with a soft, slightly damp brush such as a baby’s toothbrush.