HCA - defining ideal cut diamonds

Summary

Table 2. Weightings for Holloway Cut Adviser

Factor	Score	Exc.	Very Good	Good	Fair	Poor
Brilliance	0 - 4	0 - 0.8	0.8 - 1.6	1.6 - 2.4	2.4 - 3.2	3.2 - 4.0
Fire	0 - 2	0 - 0.4	0.4 - 0.8	0.8 - 1.2	1.2 - 1.6	1.6 - 2.0
Scintillation	0 - 2	0 - 0.4	0.4 - 0.8	0.8 - 1.2	1.2 - 1.6	1.6 - 2.0
Spread	0 - 2	0 - 0.4	0.4 - 0.8	0.8 - 1.2	1.2 - 1.6	1.6 - 2.0
Total Score	0 - 10	0 - 2	2 - 4	4 - 6	6 – 8	8 - 10

The Table 2 shows the relative weightings allotted to each of the four factors. The uniqueness of this approach is it recognises the holistic or co-dependant nature of all of a diamonds proportions.

A summary example of total scores for diamonds with a table size of 56% is shown in the topographic chart (Fig. 17).

Figure 17.