Crystallization of honey is a natural, self-regulating process and it doesn’t affect honey’s quality. Do not be alarmed if your honey becomes cloudy during storage. This is called crystallization. It is not harmful nor is it any indication of deterioration.
If your honey crystallizes, you can easily re-liquify it. Simply place the jar in a pan of hot water and stir while gently heating it. Do not overheat it though. Excessive heat may alter the flavor and color if the sugars begin to caramelize.
Also, avoid the microwave as this can get too hot too quickly. If stovetop warming is out of the question, use a bowl of hot water instead. It may take a little longer to liquify and you may need to replace the water if it cools too much, but it will work eventually.
*Information Source: National Honey Board