Most consumers look to the 4cs as a guide to diamond buying. The fact of the matter is, there are a lot of other factors experienced diamond buyers look for. For instance, a diamond may have some fluorescence in it. This means the diamond will glow blue, green, yellow, etc. under ultra violet light. This is something experienced buyers stay away from. Another important variable is the quality of the crystal. A diamond can have a certain colour and clarity grade, but it could still be milky. We are very careful and make sure to pick diamonds that have a very high quality crystal with no milkiness inside. This ensures maximum brilliance in the diamond.
This is why trust in your local jeweller is so important. They are the ones who can help you steer clear of these potholes.