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However, when you look at the fact that the diamond was graded as a VS2, you can see why it has a low percentage cut grade. A VS2 diamond has a colour grade of VS-VS1; a VS1 diamond has a colour grade of VS2. The HCA cannot differentiate between a VS2 diamond and a VS1 diamond and therefore delivers a poor cut grade. It is easy to see that the HCA is not a reliable tool as it has not been tested by approved labs and is from unknown sources.
The HCA report is a great asset to any shopper as the report can be used to help determine whether the diamond is worth the investment. However, it would be wise to use it in conjunction with the Sarin report which includes more detailed information on the diamond and also gives you the opportunity to view images of the diamond.
- Using a Diamond Rating Scale: Even when the diamond had received a good score, the HCA still delivered a low percentage GIA excellent cut grade. The only positive result was the colour band in which it was graded as excellent. This is very misleading as it does not take into account the diamonds colour grading and simply states the diamond to be excellent. To understand that, you would need to know that a VS2 diamond can have an excellent colour band and be a very poor cut grade. This is explained further in the Sarin report.
- Using a Cut Score: The HCA can also score the diamond based on its cut grade. The cut score is used in the same way as the grading score with the C/VS score by examining the percentage of the diamond that is good and the percentage that is poor. The cut grade can be used as a score and will therefore be a useful tool to the average shopper. However, in the case of a diamond which has a GIA excellent cut score, the cut grade is a little misleading as it shows the diamond to be poor in cut when it is actually a well cut stone. I would not trust the cut grade alone.
Everyone has their own opinions about what they would like to see in a diamond, what they want to spend and what they would like to receive in return. Therefore, as long as you understand the difference between an excellent cut diamond VS2 and a poorly cut diamond VS2, you can make an informed choice. 827ec27edc