An HO-3 already covers personal property under Coverage C. So why schedule a diamond ring? Because Coverage C leaves three gaps for valuables.

Gap 1, special limits: Coverage C caps what it pays for certain types of property, such as theft of jewelry. The California Department of Insurance's residential insurance guide says these amounts are not separate limits added to the contents limit; they sit inside it and cap what is paid for that type. Example: if a policy's special limit for jewelry theft is $1,500, a stolen $9,000 ring pays $1,500, and the owner bears the other $7,500.

Gap 2, named perils: Coverage C of an HO-3 insures personal property for listed perils. Simply losing a ring down a sink drain is not one of them. Scheduling moves the item to open-perils protection, which responds to accidental loss.

Gap 3, value: scheduling insures the item for its full appraised value. What scheduling does not do: it covers listed personal articles only, so it does not change how the dwelling is insured. It is no substitute for earthquake coverage, which is a separate offer.