Emerald is made of Olive Wood and stainless steel. It is water-resistant. The case diameter is 38mm. Glass is made of Sapphire, which is known in the luxury watch world as the definitive material for transparency and durability. It is colorless and optically clear. Mechanically, it is second only to diamond as the hardest and most scratch-resistant materials on earth. It comes packaged in a premium R. Burnett Wooden Box and a link remover along with instructions to give you the perfect fit.