Uniformity and FCRF Subgrades
How evenly the color spreads over an estimated diamond, and the same estimate in the three FCRF subgrades that drive an FCRF price.
The last two rows of a card describe a fancy diamond beyond its grade. In fancy color, the price depends not only on the grade but also on how the color spreads inside the cut. Two diamonds graded Fancy Vivid can differ several-fold in price.
Uniformity
The Uniformity row shows how evenly the color spreads across the diamond face up, from Low to Perfect.
| Uniformity | Dispersion letter | FCRF Dispersion |
|---|---|---|
| Perfect | A | 4+ |
| Very High | B | 4 |
| High | C | 3 |
| Medium | D | 2 |
| Low | E | 1 |
For an example diamond, Cutwise measures it on the face-up render, the second tile of the card. The Fancy dispersion stage of the run reads the color over the face of the diamond and returns a letter from A (perfectly uniform) to E. The letter becomes the Uniformity level.
For a planned diamond, the Uniformity comes from its FCRF grade. See Estimating Planned Diamonds.
Use Uniformity to compare diamonds with the same grade.
The row is hidden when the card has no such measurement.
FCRF Subgrades
The FCRF Subgrades row gives the same estimate on the scales of the Fancy Color Research Foundation (FCRF), such as Inner Grade 3 • Dispersion 3 • Undertone 4. These are the three subgrades an FCRF price is built from, for yellow, blue and pink. See FCRF Price Estimate.
| Subgrade | Read from | How Cutwise sets it for an example diamond |
|---|---|---|
| Inner Grade | the saturation of the color (chroma) | the value of the FCRF reference diamond of the same hue and grade that is closest in chroma |
| Dispersion | the evenness of the color (FCRF Color Dispersion, not fire) | the Uniformity of the diamond, on the FCRF scale |
| Undertone | the faint secondary hue, such as a brownish or greenish cast | the value of the FCRF reference diamond closest in hue angle |
Inner Grade and Dispersion take the values 1, 2, 3, 4 and 4+.
On example cards, Cutwise sets the subgrades only for a Confident Fancy Color verdict. FCRF
covers yellow, blue and pink. For any other hue, Inner Grade and Undertone show —.
A planned diamond shows the subgrades of its FCRF grade. When that grade has no Inner Grade, Cutwise sets it the same way as for an example diamond.
Example diamonds show FCRF subgrades but no price, because they are not real diamonds in Cutwise. Only a planned diamond can get an FCRF price.