Treatment of materials, namely, precious stones, semi-precious stones, gemstones, iron ore, copper uranium, and precious metals; blending of materials, namely, blending and alloying of metals; processing of chemicals, fuel materials, and electro and metal coating, metal treating and casting, hardening of metals, treatment of precious stones, semi-precious stones, gemstones; metal casting; metal coating, polishing, abrading and cutting services; copper smithing; electroplating; gilding; metal ...