While your valuables may be covered by your homeowners' policy, they may not be covered for their full value. If you want to insure your valuables for their appraised value, you will have to purchase a supplemental policy to ensure they are fully covered if they are lost, damaged, or stolen. Antiques and collectibles are just two types of valuables that may need additional coverage. If you are unsure about insuring an item, have it appraised. Having an appraisal will help your insurance agent come up with an appropriate value for your item.