CHAPTER 68 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIALS. CHAPTER 69 CERAMIC PRODUCTS. CHAPTER 70 GLASS AND GLASSWARE. SECTION XIVNATURAL OR CULTURED PEARLS, PRECIOUS OR SEMI-PRECIOUS STONES, PRECIOUS METALS, METALS CLAD WITH PRECIOUS METAL, AND ARTICLES THEREOF;