If you don’t have a good memory, taking a picture of the ring with your smartphone can help you identify it. It is important to keep in mind that you will need more than just a picture – you may also need an appraisal to sell the ring on insurance or for legal purposes. To take a picture of a ring and identify it, you should practice on a ring you know the size of first.
If you suspect the ring is fake, you should consider getting it checked by a reputable jeweler or gemologist. You can get the ring evaluated by the Gemological Institute of America (GIA), a professional organization of gemologists. However, be aware that even Gemologists are easily fooled, so beware! This is why you should care about diamonds.