The degree of processing — rough-quarried blocks, roughly trimmed slabs, polished tiles, or finished articles — determines which HTS heading applies. Rough blocks and slabs typically fall under Chapter 25, while further-worked stone articles move into Chapter 68. Misidentifying the processing stage is a common classification error that can affect both duty rates and antidumping order applicability.

Standard commercial documentation (commercial invoice, packing list, bill of lading) is required, along with a country-of-origin declaration. Where antidumping or countervailing duty orders are in scope, an AD/CVD deposit is required at entry. Some buyers also request quarry certificates or material test reports to verify stone type and grade for architectural specifications.