Holloway tools

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As an earlier form of diamond analysis, there are certain limitations that inhibit the HCA tool reports. This does not allow for the slight deviations in the angles that a diamond is cut to and instead assumes it is perfectly symmetrical. A Sarin report is able to show the deviations between facets. These imperfections can have a big impact on how the diamond handles light and these details will not be provided in the HCA score.

Likewise, it cannot measure for fluorescence and the potentially detrimental impact this can have on the beauty of a diamond. The HCA tool can be useful to shoppers in the earlier stages of their search as it is a great way of quickly ruling out any dud diamonds. When it comes to diamonds that fall within the range, further information is needed in order to make the best choice.

Where possible, an Idealscope or ASET image is preferable; this advanced technology is able to process a great deal more information pertaining to the diamond and can give a much more detailed look at the cut quality.

James Allen will also provide some diamond images on request. It is best to input Crown and Pavilion angles instead of percentages because percentages are often rounded; for example, a Likewise, some certificates uses less accurate rounded Crown percentages and Pavilion percentages. Therefore if you want to be sure that the diamond has excellent light return, you may ask the vendor to get you a Helium, Sarin or Ogi report to give you more accurate specifications of the diamond.

From the diagram, you will find the proportions to input into the HCA tool as labelled below. After inputting the diamond specifications in the formula provided, you will receive a HCA Score.

The score ranges from 0. Most people prefer diamonds that rate on the scale where: Excellent, Very Good, Good, Fair, and Poor. Zero is almost impossible because of conflicting factors; you may prefer a diamond with an HCA score of 1. To ensure and maintain this standard of quality to customers, we only accept and stock diamonds with a HCA score of 1.

Light Return — Measures the brightness of the diamond. The stronger the light return, the brighter your diamond will be. This can be analyzed in more detail with the Ideal Scope. Fire — The variety of colors you see on the diamond. The better the fire, the more fiery your diamond will appear with flashes of rainbow colors.

Scintillation — The movement of fire and intense sparkles when you move your diamond. Spread — This refers to the perceived size from the top view of the diamond. The wider the diamond, the larger it will appear, and hence, the spread will be considered better.

However, a diamond that is cut too wide will have more light leakages, reducing its light return, fire and scintillation. As a result, the spread has an inverse relationship with light return, fire and scintillation , where to attain an excellent spread wider diamond , you will have to sacrifice the light return, fire and scintillation.