Ruby Sappphire Emerald Tanzanite Peridot Amethyst Opal Garnet Tourmaline
Aquamarine
Gems under $100
Other Gems Gem-Intrusion
Matched Pairs &
Suites
Natural
Gemstones Enhancements
"Enhancement" - any traditional process
other than cutting and polishing that improves the appearance (color/clarity/phenomena),
durability or availability of a gemstone.
Symbols For Specific Forms of Enhancement
Natural Gemstones Enhancement Chart
(based on the AGTA Source Directory )
| Natural Gemstone |
Enhancement Symbol |
Description Used |
Frequency |
Stability |
Care Requirements |
| Agate | D |
|
Usually |
Excellent to good |
Normal |
| Fire Agate | N |
|
|
|
Normal |
| Alexandrite | N |
|
|
|
Normal |
| Amber | E or H |
|
Usually |
Very good to good |
*Special |
D |
|
Rarely |
Variable |
Special | |
| Amethyst | E or H |
|
Occasionally |
Excellent |
*Special |
| Ametrine | N |
|
|
|
Normal |
| Andalusite | N |
|
|
|
Normal |
| Aquamarine | E or H |
|
Usually |
Excellent |
Normal |
| Beryl | R |
Maxixe |
Always |
Poor |
X-Special |
R |
Yellow |
Usually |
Variable |
Special | |
N |
Yellow-green |
|
|
Normal | |
E or O |
Red |
Commonly |
Very good to fair |
Special | |
| Chalcedony | D |
Black |
Always |
Excellent to good |
Normal |
D |
Banded |
Usually |
Excellent |
Normal | |
D |
Green |
Usually |
Good to fair |
Special | |
D |
Blue |
Commonly |
Good to fair |
Special | |
E or H |
Carnelian |
Usually |
Excellent |
Normal | |
D |
Carnelian |
Occasionally |
Excellent to good |
*Special | |
D |
Jasper |
Occasionally |
Excellent |
Normal | |
N |
Chrysoprase |
|
|
Normal | |
| Chrysoberyl | N |
Transparent |
|
|
Normal |
R |
Cats eye |
Occasionally |
Excellent |
Normal | |
| Citrine | E or H |
|
Usually |
Excellent |
Normal |
| Coral | N |
Black |
|
|
*Special |
E or B |
White |
Commonly |
Good |
Special | |
E or W |
Pink |
Commonly |
Good |
Special | |
I |
Orange |
Commonly |
Good |
Special | |
B |
Gold |
Usually |
Very good |
Special | |
D |
Red |
Occasionally |
Variable |
X-Special | |
| Natural Gemstone |
Enhancement Symbol |
Description Used |
Frequency |
Stability |
Care Requirements |
| Diamond | L |
|
Occasionally |
Very good |
Normal |
C |
|
Rarely |
Very good to poor |
Special | |
F |
|
Occasionally |
Very good |
Special | |
HP |
|
Rarely |
Unknown |
Special | |
| Diamond Fancy | R |
|
Occasionally |
Excellent to very good |
Special |
L |
|
Occasionally |
Very good |
Normal | |
F |
|
Rarely |
Very good |
Special | |
C |
|
Rarely |
Fair to poor |
Normal | |
H |
|
Rarely |
Unknown |
Normal | |
| Diopside Chrome | N |
|
|
|
*Special |
| Emerald | E or O |
|
Usually |
Very good to fair |
Special |
D |
|
Occasionally |
Variable |
Special | |
| Garnet | N |
All varieties |
|
|
*Special |
E or H |
Some demantoid |
Commonly |
Very good |
*Special | |
| Hematite | N |
|
|
|
Normal |
| Iolite | N |
|
|
|
Normal |
| Jade Jadeite | E or W |
|
Commonly |
Fair |
Special |
B and I |
Green/purple/white |
Commonly |
Very good to good |
Special | |
D |
|
Occasionally |
Variable |
Special | |
B and W |
|
Rarely |
Poor |
Special | |
| Jade Nephrite | D |
|
Rarely |
Unknown |
Special |
| Kunzite | E or H |
|
Commonly |
Fair |
Special |
R |
|
Commonly |
Fair |
Special | |
| Natural Gemstone |
Enhancement Symbol |
Description Used |
Frequency |
Stability |
Care Requirements |
| Lapis lazuli | E or W |
|
Commonly |
Fair |
Special |
D |
|
Commonly |
Variable |
Special | |
| Moonstone | N |
|
|
|
Normal |
| Morganite | E or H |
|
Commonly |
Excellent |
Normal |
| Opal | O |
White/black |
Rarely |
Fair |
Special |
I |
|
Rarely |
Good |
Special | |
O |
Boulder |
Usually |
Good |
Special | |
D |
Matrix |
Commonly |
Good |
Special | |
N |
Fire opal |
|
|
*Special | |
I |
Cats eye |
Usually |
Good |
Special | |
I/O/D |
Hydrophane |
Commonly |
Good to fair |
Special | |
| Pearl Natural | E or B |
White |
Usually |
Very good |
Special |
D |
|
Rarely |
Very good to good |
Special | |
| Pearl Cultured | E or B |
White |
Usually |
Excellent |
Special |
D |
Many colors |
Usually |
Variable |
Special | |
R |
Black/gray |
Occasionally |
Very good |
Special | |
| Peridot | E or O |
|
Rarely |
Good to fair |
Special |
F |
|
Rarely |
Good |
Special | |
| Ruby | E or H |
|
Usually |
Excellent |
Normal |
H |
|
Usually |
Excellent |
Normal | |
O |
|
Occasionally |
Good to fair |
Special | |
D |
|
Rarely |
Poor |
Special | |
R |
|
Rarely |
Unknown |
Normal | |
F |
|
Commonly |
Very good to fair |
Special | |
U |
|
Rarely |
Good |
Special | |
| Natural Gemstone |
Enhancement Symbol |
Description Used |
Frequency |
Stability |
Care Requirements |
| Sapphire | E or H |
|
Usually |
Excellent |
Normal |
U |
|
Occasionally |
Good to fair |
Special | |
O |
|
Occasionally |
Good to fair |
Special | |
| Sapphire Fancy | E or H |
|
Usually |
Excellent |
Normal |
R |
Yellow/orange |
Occasionally |
Very poor |
X-Special | |
O |
|
Occasionally |
Good to fair |
Special | |
U |
|
Occasionally |
Good to fair |
Special | |
| Serpentine | D |
Various colors |
Commonly |
Good to fair |
Special |
E or W |
|
Commonly |
Very good to good |
Special | |
| Spinel | N |
|
|
|
Normal |
O |
|
Occasionally |
Good to fair |
Special | |
| Sugelite | N |
|
|
|
Normal |
| Sunstone | N |
|
|
|
Normal |
| Tanzanite | E or H |
|
Usually |
Excellent |
*Special |
| Topaz | R |
Blue |
Usually |
Excellent |
Normal |
R |
Yellow/orange |
Occasionally |
Variable |
Special | |
R |
Green |
Occasionally |
Poor |
X-Special | |
U |
Green |
Usually |
Good |
Special | |
N |
Brown |
|
|
*Special | |
E or H |
Red/pink |
Usually |
Excellent |
Normal | |
| Natural Gemstone |
Enhancement Symbol |
Description Used |
Frequency |
Stability |
Care Requirements |
| Tourmaline | N |
Chrome green |
|
|
Normal |
N |
Cats Eye |
|
|
Normal | |
E or H |
Yellow/orange |
Rarely |
Excellent |
Normal | |
R |
Yellow/orange |
Rarely |
Very good |
Normal | |
E or H |
Green/blue |
Commonly |
Excellent |
Normal | |
O |
Any color |
Occasionally |
Good to fair |
Special | |
E or H |
Pink/red/purple |
Occasionally |
Excellent |
Normal | |
R |
Pink/red/purple |
Commonly |
Good |
Normal | |
D |
Pink/red/purple |
Occasionally |
Fair to poor |
Special | |
| Turquoise | W |
|
Commonly |
Fair to poor |
Special |
D |
|
Rarely |
Poor |
X-Special | |
I |
|
Commonly |
Good |
Special | |
| Zircon | N |
Green/brown |
|
|
*Special |
E or H |
Blue/colorless |
Always |
Fair to poor |
Special | |
E or H |
Yellow |
Rarely |
Good |
Special | |
E or H |
Red |
Commonly |
Fair to poor |
Special |
Notes:
Ruby Sappphire Emerald Tanzanite Peridot Amethyst Opal Garnet Tourmaline
Aquamarine
Gems under $100
Other Gems Gem-Intrusion
Matched Pairs &
Suites
GEMFIX
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