In order to better understand Cut, we need to firstly understand what Cut means in terms of fire & brilliance and light refraction.
The diagram to the left aptly shows what happens when a Diamond is Cut ideally, Vs. what happens when the stone is not Cut well.
The top picture shows an Ideal Cut Diamond - you can clearly see that the light entering the Diamond is reflected from one facet to another and eventually is reflected back through the top of the stone in its entirety resulting in a brilliant, sparkly Diamond.
The middle diagram shows what happens when a Diamond is cut too deep. Much of the light entering the top of the Diamond escapes through the side of the stone (pavilion), resulting in a less than sparkling stone.
The last scenario is the shallow, or thin Cut stone. What happens when a Diamond is cut too shallow is that the light entering the top of the stone escapes through the pavilion before it can be reflected back through the top (table) of the Diamond.
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