When buying diamonds, you are advised to consider the “four cs”
Carat – You will see this abbreviated to “ct” in descriptions.
Clarity – The best clarity is IF (internally flawless, meaning there are no inclusions visible even to the most experienced grader) and the most included stones are described as I3 (obvious inclusions, visible to the unaided eye).
Colour – the most perfect and expensive diamonds are “colourless”. It is also described on a scale with the rarest colour being D and the more tinted stones coming in at M and N.
Cut – The modern round brilliant cut is by far the most popular cut when it comes to diamonds but the emerald cut (rectangular) is also popular.
