| CARAT |
|---|
| Size Range 0.18 Up |
| CLARITY |
|---|
| FL, IF, VVS1, VVS2, VS1, VS2, SI1, SI2, I1 |
| COLOR |
|---|
| D, E, F, G, H, I, J, K, L M N-R S-Z |
| CUT | |
|---|---|
| Cut Grades | Description |
| EX | Excellent |
| G | Good |
| F | Fair |
| POLISH | |
|---|---|
| Polish Grades | Description |
| EX | Excellent |
| G | Good |
| F | Fair |
| SYMMETRY | |
|---|---|
| Symmetry Grades | Description |
| EX | Excellent |
| G | Good |
| F | Fair |
| WHITE INCLUSION BASE | |||
|---|---|---|---|
| Grade | Inc.Type | Location | Size/Des |
| N(WC0/WT0) | White | -- | None |
| NV | White | -- | None Visible |
| WC1 | White | Crown | Minor |
| WT1 | White | Table | Minor |
| WC2 | White | Crown | Medium |
| WT2 | White | Table | Medium |
| WC3 | White | Crown | Major |
| WT3 | White | Table | Major |
| BLACK INCLUSION BASE | |||
|---|---|---|---|
| Grade | Inc.Type | Location | Size/Des |
| N(WC0/WT0) | Black | -- | None |
| NV | Black | -- | None Visible |
| BC1 | Black | Crown | Minor |
| BT1 | Black | Table | Minor |
| BC2 | Black | Crown | Medium |
| BT2 | Black | Table | Medium |
| BC3 | Black | Crown | Major |
| BT3 | Black | Table | Major |
| OPEN BASE | |||
|---|---|---|---|
| Grade | Inc.Type | Location | Size/Des |
| N(WC0/WT0) | Open | -- | None |
| NV | Open | -- | None Visible |
| OC1 | Open | Crown | Minor |
| OT1 | Open | Table | Minor |
| OC2 | Open | Crown | Medium |
| OT2 | Open | Table | Medium |
| OC3 | Open | Crown | Major |
| OT3 | Open | Table | Major |
| FLUORESCENCE | |
|---|---|
| Fluorescence Grades | Parameters |
| N | None Fluorescence |
| FNT | Faint Fluorescence |
| MED | Medium Fluorescence |
| STG | Strong Fluorescence |
| VST | V.Strong Fluorescence |
| COLOUR SHADE BASE | ||
|---|---|---|
| Grade | Color Shade | Description |
| N | WH/OF WH/YL | -- |
| NV | Brown/Gray/Pink | None Visible |
| BRN1 | Brown | Faint |
| BRN2 | Brown | Light |
| BRN3 | Brown | Dark |
| MILKY BASE | ||
|---|---|---|
| Grade | Inc. Type | Size/Des |
| N(M0) | Milky | None |
| NV | Milky | Minor |
| M1 | Milky | Minor |
| M2 | Milky | Medium |
| M3 | Milky | Major |
| GRANNING BASE | ||
|---|---|---|
| Grade | Inc. Type | Description |
| N | None | NO |
| INT Y | Internal Graining | Yes |
| SRF Y | Surface Graining | Yes |
| EYE CLEAN BASE | ||
|---|---|---|
| Grade | % | Description |
| EC1 | 90% - 100% | Sure |
| EC2 | 50% - 74% | Medium |
| M1 | Milky | Minor |
| EC3 | 25% - 49% | Medium |
| V | 0% - 25% | Inclusion visible |
| FANCY COLOR | ||
|---|---|---|
| Intensity | Overtone | Fancy Color |
| Fancy Light | Greenish | Green |
| Fancy | Yellowish | Yellow |
| Fancy Intense | Orangish | Orange |
| Fancy Dark | Pinkish | Blue |
| Fancy Deep | Brownish | Pink |
| Fancy Vivid | -- | Brown |
| NVDark | Brownish | Purplish |
