Gemstone Enhancements

ROUND BRILLIANT CUT STONES

Gemstone Enhancements

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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 N 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 H 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 N None N/A N/A Normal
Opal-Boulder O Infusion of colorless substances Occasional Fair Special Avoid Heat/Ultrasonic/Chemicals
Opal-Fire N 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
D Dyeing-Artificial Color
F Filling-Durability/Appearance
H Heating-Color/Clarity
R Irradiation-Color Enhancement
O Oiling/Resin Infusion-Appearance
N None
DI Diffusion-Chemicals and High Temperature-Artificial Color
WO Waxing Oiling-Colorless Wax or Oil Introduced for Clarity
LC Laser/Chemicals-Laser Chemicals to alter inclusions
PI Plastic Introduction-Durability/Appearance
WO Waxing Oiling-Appearance
HP Heating/Pressure-Color/Clarity
AGTA Member
AGTA members believe in more than just selling the world's highest quality gemstones and cultured pearls. They share a mine-to-market mentality-the belief that the gem trade should be as transparent and ethical as possible.
That's why, in 1984, the AGTA and its members developed the industry's strictest and most comprehensive Code of Ethics and Fair Business Practices. Every year since then, the AGTA and its members annually commit to leading the industry in standards of disclosure, transparency, and ethical practices.
The AGTA and its members take pride in working toward a gem industry that benefits everyone involved. Whether it's investing in the communities that produce gemstones, supporting individuals whose lives have been impacted by the gem trade, or cooperating with foreign governments to improve working conditions, AGTA members continually work to hold the gem industry to the highest possible business standards.
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