If you left your diamond engagement ring unattended for a long time, you can see a glaze of dirt or grime on the gemstone. This means that you will have to clean your diamond ring regularly, even if you do not wear it that often.   The best way to clean a diamond ring is to give it to the professionals. However, this might not be a practical option all the time, especially in case of engagement or wedding rings, which you use almost every day. Luckily, you can clean diamond rings at home using some simple tricks. One of the easiest methods is to rub the diamond ring using a slice of lemon, which is actually a good cleanser. However, the acidic nature of lemon may corrode certain precious metals. So, only use this if your metal is compatible with citric acid. Another simple method is to dip your diamond rings in boiling water, which will loosen the dirt and grime on your ring. After this, clean it using a soft-bristled brush or a wet cloth, and air-dry the ring.