Section 13 ARTICLES OF STONE, PLASTER,CEMENT,ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE 68 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIALS 68 04 STONE, OF AGGLOMERATED NATURAL OR ARTIFICIAL ABRASIVES, OR OF CERAMICS, 68 04 21 OTH. MILLSTONES/GRINDSTONES/..OF AGGLOMERATED SYNTHETIC OR NATURAL DIAMOND Commodity Code Description 68 04 21 00 OTH. MILLSTONES/GRINDSTONES/..OF AGGLOMERATED SYNTHETIC OR NATURAL DIAMOND