Gemstone Enhancements

Gemstone

Code

Enhancement Method

Use

Stability

Care

Notes

Alexandrite

N

None

N/A

N/A

Normal

 

Amethyst

H

Heated to Lighten Color

Occasional

Excellent

Special

Some unheated stones may fade in color

Aquamarine H Heated to remove yellow Usually Excellent Normal

Beryl-Red

H or O

Colorless Oil to fill fissures 

Common

Very Good

Special

Avoid High Temperature

Beryl-Pink

H

Heated to remove yellow 

Common

Excellent

Normal

 

Chrysoberyl 

None 

N/A 

Excellent 

Normal 

 

Chrysoberyl-Cats Eye

R

Irradiated to Change Color

Occasional

Excellent 

Normal 

 

Diamond-Colorless 

LC 

Laser drilled to improve appearance 

Common/Occasional 

Very Good 

Normal 

 

Diamond-Colored

LC,F, or R 

Laser drilled to improve appearance 

Irradiated for fancy color 

 Very Good

 

Occasional

Very Good 

 

Fair/Poor

Normal

 

Special

 

Steaming/Ultrasonic may affect color/appearance

 

Emerald

H or O

Oil, Wax or Resin to improve appearance 

Common 

Fair/Very Good 

Special 

Avoid Chemicals/Ultrasonic 

Garnet 

N

None 

N/A 

N/A 

Normal

 

Kunzite

Heated to improve color 

Common 

Fair 

Special 

Avoid strong light/ultrasonic 

Opal-White,Black N None N/A N/A Special Avoid Heat/Ultrasonic/Chemicals

Opal-White,Black

O

Impregnated with Oil 

Rarely 

Fair 

Special

Avoid Heat/Ultrasonic/Chemicals 

Opal-Boulder

None

N/A

N/A

Normal 

 

Opal-Boulder 

O

Infusion of colorless substances 

Occasional 

Fair 

Special

Avoid Heat/Ultrasonic/Chemicals 

Opal-Fire

None 

N/A 

N/A

Special 

Avoid Heat

Pearl-Natural

B

Bleached to improve color 

Common 

Very Good 

Special 

Avoid Chemicals

Pearl-Natural

D

Dyed to produce grey/black 

Rarely 

Good/Very Good

Special

Avoid Chemicals/Ultrasonic

Peridot

N

None

N/A

N/A

Normal

 

Peridot

H or O

Improve appearance

Rarely

Good/Fair

Special

Avoid Heat/Ultrasonic/Chemicals

Ruby N None N/A N/A Normal

Ruby

H

Improve color/appearance

Usually

Excellent

Normal

 

Ruby

D or F

Improve color/appearance

Common

Good/Poor

Special

Avoid Heat/Ultrasonic/Chemicals

Ruby DI Artificial color Occasional Good Special Avoid repolishing

Sapphire

N

None

N/A

N/A

Normal

 

Sapphire

H

Improve color/appearance

Usually

Excellent

Normal

 

Sapphire

DI

Artificial color

Common

Good

Special

Avoid repolishing

Sapphire

R

Intense yellow or orange color

Occasional

Very Poor

Special

Fades quickly in light/heat

Spinel

N

None

N/A

N/A

Normal

 

Tanzanite

H

Heated to produce blue/violet color

Usually

Excellent

Special

Avoid temperature changes

Topaz-Blue

R/H

Heated/Irradiated for color

Usually

Excellent

Normal

 

Topaz-Yellow/Orange

R

Intensify color

Occasional

Fair

Special

Avoid heat/strong light

Topaz-Pink

H

Heated for color

Usually

Excellent

Normal

 

Topaz-Green

R

Irradiated to produce color

Usually

Good

Special

Avoid repolishing

Tourmaline

N

None

N/A

N/A

Normal

 

Tourmaline

H

Heated for color

Common

Excellent

Normal

 

Tourmaline

R

Irradiated to intensify color

Common

Good

Normal

 

Zircon

N

None

N/A

N/A

Special

Avoid abrasives

Zircon

H

Heated for color

Rarely

Good

Special

Avoid abrasives/strong light

B Bleaching-Artificial Color                                        DI Diffusion-Chemicals and High Temperature-Artificial Color

D Dyeing-Artificial Color                                           WO Waxing Oiling-Colorless Wax or Oil Introduced for Clarity

F Filling-Durability/Appearance                                  LC Laser/Chemicals-Laser Chemicals to alter inclusions

H Heating-Color/Clarity                                            PI Plastic Introduction-Durability/Appearance

R Irradiation-Color Enhancement                               WO Waxing Oiling-Appearance      

O Oiling/Resin Infusion-Appearance                           HP Heating/Pressure-Color/Clarity 

N None 

                                                     

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