Brilliant Ideal and Firey Ideal CutsSeeing is believing?
The cut adviser system recognizes three distinct types of diamonds with optimum beauty. To qualify as an HCA Ideal Cut a diamond must rate as excellent or score less than 2.0.
Brilliant Ideal Cuts (BIC) have the highest light return and larger spreads. Fiery Ideal Cuts (FIC) have more fire or spectral color and appear to have more facets and scintillation because of the increased interaction between the steeper crown facets that direct your view deeper and further into the pavilion.
Those two factors mean lead some people to feel FICs have a romantic look, even though they display slightly less brilliance. But because they are smaller than BICs, but when spread and cost are considered many consumers trade beauty for desirability and switch to TICs or BICs.
The Tolkowsky Ideal Cuts (TIC) combine a balance of fire and brilliance, but diamonds close to Tolkowsky proportions command a price premium. So again when given the choice it has been my experience that BICs have the most demand.
This is rather fortuitous because the yields on BIC are better than the other two types of ideal cuts. In fact FICs are few and far between.
||Crown angles (HCA score must be <2.0)|
|BIC Brilliant Ideal Cut
||Crown angle is less than 32.5°|
|TIC Tolkowsky Ideal Cut
||Crown angles between 32.5° and 35.5°|
|FIC Firey Ideal Cut
||Crown angle is more than 35.5°|
Brilliant Ideal Cut
Firey Ideal Cut
In the representation the oval shows the approximate range of each classification. Separating diamonds graded as excellent into these sub groupings will assist cutters and dealers in meeting the demands of different markets and will assist in establishing pricing information.