Diamonds are coded for Colour and Clarity.
The first letter denotes the colour quality.
G H I J
All these letters are classed as near colourless and are of a very good quality.
VSI (Very Small Inclusions)
All diamonds have small flaws in, the less flaws the higher the quality and the more expensive it is.VSI grade diamonds have small inclusions (flaws) not seen by the naked eye and are classed as luxury grades