The requirement that a surplus lines broker must make a good-faith effort to place insurance coverage with admitted carriers in the standard market before resorting to the non-admitted (surplus lines) market. The diligent search typically requires the broker to contact a specified number of admitted insurers (often three or more, depending on state requirements) and document their declinations or inability to provide adequate coverage. The broker must maintain records of the search efforts, including which carriers were contacted, dates of contact, and reasons for declination. This requirement protects the admitted market and ensures that surplus lines are used only when standard market options are genuinely unavailable.