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American Gem Trade Association Enhancement Codes
N
Natural
E
Enhanced, which describes any of the following:
ASBL
Assembled into single stones created with two or more separate pieces
B
Bleached
C
Coated with lacquer, enamel, foils, etc.
D
Dyed to intensify color or uniformity
F
Filling added to the surface with clear glass, plastic, or borax
H
Heated to alter color, clarity, and/or phenomena
HP
Heated and pressurized to affect color and clarity
I
Impregnated with plastic to improve durability
L
Lasers and chemicals used to alter inclusions (this one is for diamonds)
O
Oil fills the surface fissures to improve appearance; wax and resin also used in this technique
R
Irradiation (gamma and/or electron bombardment) is used to alter color.
SYN
Synthetic-manmade, but created with the same composition and structure as the real thing
U
Diffusion-a chemical/heat treatment to produce color and/or phenomena
W
Wax or oil is introduced to opaque or translucent stone to improve appearance