Most pieces are microwave and dishwasher safe (exceptions will be noted in the description), however I do recommend avoiding the use of either of these appliances.  The abrasive nature of dishwasher detergent *may* dull the vibrancy of the glaze over time.  Additionally, some of the darker red and black clays I occasionally use contain iron, and microwaving these pieces could cause your pottery to become very hot when removed.