Page 55 - Thailand Gems & Jewelry Guide Book English_China Version
P. 55
Thailand’s Gems & Jewelry Guide Book
55
GIA Color Scale
Trade Terms
Colorless
to
D
Jager
Finest White
Colorless
E Colorless
River
F
Fine White
Stones in these grades look G
Top Weselton
colorless face-up; slight traces White
Weselton
of color will not be apparent in H
mounted stones to other than Near
Colorless the trained eye.
I
Wesselton
Commercial Top Crystal
White
Small stones in these range J
Top Silver Cape
Crystal
will look colorless face-up
when mounted, but large one K
will be tinted.
Faint Sliver Cape
Top Crystal
L
Yellow
Cape
M
Light Cape
Low Cape
N
Very O
Light P
Yellow
Cape
Q
R
Low S
Light Mounted stones in these
T
Yellow
grades will display a Yellowish
tint even to the untrained eye.
U
Light
V
Dark Cape
Yellow
W
X
Y
Z
Fancy
Fancy
Yellow
Source : Gemological Institute of America (GIA)
Note: Fancy color diamonds, which can be any color from blue
to green to bright yellow; do not follow this rule as they are very rare
and expensive. They are actually more valuable for their color and
clarity.
* บางครั้งคนไทยจะเรียกสีของเพชรว่า “น้ําา” เพชรน้ําายิ่งสูงก็จะยิ่งขาวเเละไม่มีสีเหลืองเจือปน
โดยเริ่มต้นจาก D คือน้ําา 100%, E คือ น้ําา 99% และ F คือน้ําา 98% ลดหลั่นกันไป
