5 Beautiful, Durable, Large Mug Posted by Kim Williams-Mann on 12th Jan 2021 We love Hartstone and have many mugs in our home as well as those we have gifted to our family and friends. They don't chip, are beautifully crafted, and are a wonderful addition to our home. These mugs are extra special in that they hold 15-16 oz. and are perfect for that nice large cup of coffee, latte, or hot chocolate. Love these, they are the best mugs!!!