Originally Posted by Andie

Diamonds are normally rated VS1 or VS2 and then given a letter for colour A-D (rare) being best, E to G and so on. Even a shop cannot give you an exact grading, but they could tell you if they are real. If you are in London go to either Grays Antique Market and see someone like Micheal Longmore, JLA or Anthea AG.

If not go to a jewellery shop, not the likes of Ernest Jones etc.

I used to work for someone in the trade.