Don't jumble your jewelry:
Always store your jewelry in a clean, dry place.
Keep your jewelry in a fabric-lined jewelry case, or in a box with numerous compartments and dividers.
If you prefer to use ordinary boxes, wrap each piece individually in soft tissue paper. This keeps your jewelry untangled and will help keep it from tarnishing.
The problem with a lot of jewelry boxes is that they don't have enough compartments and that causes your jewelry to get jumbled together. Look for a style with many little compartments over the styles that have a few larger sections.