Jewelers Mutual filed a rate and rule update in California for its Jewelers Block and Jewelers Standard commercial inland marine programs.

The filing proposes an overall 14% rate increase, compared to an actuarially indicated increase of 59.4%, with a requested effective date of September 1, 2026. The changes would affect 828 policyholders and generate approximately $769,000 in additional written premium.

In addition to the rate increase, Jewelers Mutual is proposing revisions to all other perils (AOP) deductible factors, location type factors, stock AOP base rates, construction type factors, and workmanship rates, while introducing higher workmanship coverage limits. The filing also modifies the business personal property formula for the Jewelers Block program, moves the replacement cost factor from a rule to the rate manual, and incorporates the correct RBYZONE table that was intended to be included in a 2020 filing.

The Wisconsin-based insurer, which specializes in serving the jewelry industry and writes commercial coverage nationwide under its Jewelers Block and Jewelers Standard programs, said the filing also updates underwriting rules. Among them, accounts with total stock limits below $450,000 that have not been updated for at least three years will be asked to provide current information to help ensure accurate coverage.