Even though they are the hardest substance known to man, diamonds can still be chipped by a strong blow to its edges or corners. It is advised that you do not wear diamonds(rings) whilst doing household chores or physical labour.
We highly recommend that you have your diamond jewellery inspected by a reputable jeweller every 6-12 months depending on how often your wear them. Your jeweller can check the settings to ensure that the diamonds are held securely in place and conduct ultrasonic cleaning to your jewellery.
At home you may soak your diamonds in an ammonia based household cleaner overnight, and then brush it with a soft brush and soak it in a bowl of water.(Not under the sink).