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Diamond color grading scales[1]
| GIA |
Status: current |
AGS |
Status: current |
AGS |
Status: historical: pre 1995 |
CIBJO Status: current |
IDC |
Status: current |
Scan. D.N. |
Status: current |
Old World Terms |
Status: historical |
| grade and description[2] |
grade and electronic colorimeter scale[3] |
grade and electronic colorimeter scale[3] |
grade[4] |
grade and description[4] |
grade for .50ct and over[5] |
grade for under .50ct |
series 1 scale[4] |
series 2 scale[4] |
| D |
Colorless |
0 |
0 - 0.49 |
0 |
0 - 0.75 |
Exceptional white + |
Exceptional white + |
Colorless |
River |
White |
Finest White |
Jager |
| E |
0.5 |
0.5 - 0.99 |
Exceptional white |
Exceptional white |
River |
| 1 |
0.76 - 1.35 |
| F |
1.0 |
1.0 - 1.49 |
Rare white + |
Rare white + |
Colorless when viewed through the crown |
Top Wesselton |
Fine White |
| 2 |
1.36 - 2.00 |
| G |
Near Colorless |
1.5 |
1.5 - 1.99 |
Rare white |
Rare white |
Top Wesselton |
| H |
2.0 |
2.0 - 2.49 |
3 |
2.01 - 2.50 |
White |
White |
Wesselton |
White |
Wesselton |
| I |
2.5 |
2.5 - 2.99 |
4 |
2.51 - 3.0 |
Slightly tinted white |
Slightly tinted white |
Slightly colored |
Top Crystal |
Slightly tinted white |
Commercial White |
Top Crystal |
| J |
3.0 |
3.0 - 3.49 |
5 |
3.01 - 3.75 |
Crystal |
Top silver cape |
Crystal |
| K |
Faint Yellow |
3.5 |
3.5 - 3.99 |
Tinted white |
Tinted white |
Top cape |
Tinted white |
Top cape |
| 6 |
3.76 - 4.5 |
Silver cape |
| L |
4.0 |
4.0 - 4.49 |
| M |
4.5 |
4.5 - 4.99 |
7 |
4.51 - 5.50 |
Tinted color 1 |
Tinted color |
Slightly colored to colored |
Cape |
Tinted color |
Light cape |
Cape |
| N |
Very Light Yellow |
5.0 |
5.0 - 5.49 |
Tinted color 2 |
Low Cape |
| O |
5.5 |
5.5 - 5.99 |
8 |
5.51 - 7.0 |
Light yellow |
Cape |
Very light yellow |
| P |
6.0 |
6.0 - 6.49 |
Light yellow |
| Q |
6.5 |
6.5 - 6.99 |
| R |
7.0 |
7.0 - 7.49 |
9 |
7.01 - 8.5 |
| Dark cape |
| S |
Light Yellow |
7.5 |
7.5 - 7.99 |
Tinted color 3 |
Yellow |
| T |
8.0 |
8.0 - 8.49 |
| U |
8.5 |
8.5 - 8.99 |
10 |
8.51 - 10.00 |
| V |
9.0 |
9.0 - 9.49 |
| W |
9.5 |
9.5 - 9.99 |
| X |
10.0 |
10 + |
10+ |
| Y |
| Z |
- ^ Organizations: GIA - Gemological Institute of America, AGI - Antwerpse Gemologische Instelling, AGS - American Gem Society, CIBJO - Confédération International de la Bijouterie, Joaillerie, Orfèvrerie des Diamantes, Perles et Pierres (World Jewellery Confederation), IDC - International Diamond Council, Scan. D.N. - Scandinavian Diamond Nomenclature
- ^ Diamond Grading: Lab Manual Gemological Institute of America, Carlsbad, 2004
- ^ a b The AGS Way: Diamond Grading Standards American Gem Society, 1999
- ^ a b c d Pagel-Thielsen, Verena G.G., F.G.A. Diamond Grading ABC: The Manual Rubin & Son n.v., Antwerp, 9th edition, 2001, ISBN 3-9800434-6-0.
- ^ Engagement Diamond FAQ
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