These slate coasters are great. I love them! They are made of natural slate, and are a dark charcoal-black color. A few have little inclusions of metallic gold pyrite -- that's a natural part of this stone. I engrave the design right into the surface of the stone, so they are easy to clean, with regular dish-soap or glass-cleaner. The design will not rub or scrape off.
These drink coasters make a great housewarming gift, new home gift, first home gift, wedding gift, wedding favors, groomsman gift, and more. They're great for yourself, too, because they're just that cool.