The first thing before you shop for a diamond, prefer visiting a reliable jeweler shop because they will definitely think ten times before selling a fake stone to their guests.
When you are planning to buy a diamond, try investigating as much as you can from the jeweler and do judge his gestures, because few con men can be recognized through their way of communication.
While selecting a diamond, check whether it has any scratches on it, a real diamond has no scratches while few stones which resembles diamond like, moissanite makes scratches visible when it is scratched.
Another perfect method to distinguish a real and fake stone is by seeing through it. When a light is refracted through the diamond you can easily see through it, whereas other stones do not possess this quality.
During the selection of your favourite stone, ask the jeweler to show you few in gold as well as sliver plated designs, which has a diamond attached in it. This is another perfect way to judge if your jeweler is a con man, because you will never find diamond in a cheap quality metal.
Never forget to get a certificate or a receipt of the diamond you have bought, just for the sake of record. There is a special certificate which is issued by the Gemological Institute of America. This organization is responsible to provide the diamond buyers, a report which mentions the reality of the stone and its grade as well.
The last step is to visit a reliable jeweler and tell him to examine the stone and judge its originality, but the GIA report is the perfect way to know about your diamond.
Being careful is the best way to protect your money or else you might end up regretting. Do not buy anything from a new shop until you are sure about the place whether it is available temporarily or permanently.