The term "blue white" should not be used any more, the traditional term River is superseded with "rarest white" (R). Then follows "rare white" (TW), "white" 0N), "slightly tinted white" (TCR+CR), "tinted white" (TCA) , "slightly yellowish (CA) , "yellowish" (L Y) and "yellow" M.
The abbreviations are derived from the old terms. For
cut diamonds under half a carat (0,47 ct) and diamonds which cannot be
classified in the yellow series, less detailed grading is recommended:
white - slightly tinted white - tinted white - tinted color.
The SCAN.D.N. color Table
|
|
Traditional |
Descriptive |
Less Detailed |
|
GIA |
'Terms |
Terms |
Terms |
|
Grades |
|
||
|
0 |
|
Rarest White |
|
|
|
River |
|
|
|
E |
|
|
|
|
F |
|
|
White |
|
|
Top Wesselton |
Rare White |
|
|
G |
|
|
|
|
11 |
Wesselton |
White |
|
|
I |
Top Crystal |
Slightly Tinted |
Slightly Tinted |
|
|
|
White |
White |
|
J |
Crystal |
|
|
|
K |
|
|
|
|
|
Top Cape |
Tinted White |
Tinted White |
|
L |
|
|
|
|
M |
|
Slightly |
|
|
|
Cape |
Yellowish |
|
|
N |
|
|
|
|
0 |
|
|
|
|
P |
|
|
|
|
|
Light Yellow |
Yellowish |
Tinted color |
|
Q |
|
|
|
|
R |
|
|
|
|
S-Z |
Yellow |
Yellow |
|
Diamonds of a different hue are described as for instance greenish-yellow, brownish-yellow or pink.
A light Source with a color temperature of 5,000 to 5,500 degrees Kelvin is used as a basis for color graduation, as well as a master set of brilliants the Position of which within the color grade has been established. In cases of doubt the lower grade should be chosen. It must be pointed out, that in color graduation, the size of the stone, its symmetry, proportion, girdle and inclusions must be considered.
Florescence properties are observed in long wave ultra violet light and determines as nil - slight - medium - strong.
| IDC | color-Grading |